Blower Motor Relay Keeps Burning Out







Usually, you will lose the highest of four speeds in the blower motor first. If the fuses,relay,resistor and blower motor checks out okay like you said, i start by checking the blower switch and work my way towards the motor. The blower motor gets power from sub fusable link #6 to fuse #16 in the drivers footwell. I finally found the simple solution and ultimately the actual cause to the issue of the blower resistor burning out and over-heating the plug wiring - The blower motor itself is the culprit! After years of replacing the blown resister module 3 to 4 a year, I finally bit the bullet and bought a new blower fan/motor. If the blower motor resistor harness is burned, what do you do about it? pull the wires and repin into a new plug? Why are they notorious for burning?. Why does the blower reasistor always goes out (2005 Chevrolet Colorado) My 2005 Chevy Colorado's heater/ AC blower motor control knob only works only on high (No. There are a couple of tools out there [for testing motors], like the TECMate [from Genteq]. It's possible for the electrical failure of the blower motor resistor to take out one or both of these fuses as it melts. It sounds like that they installed either a bad motor or the wrong size motor for your system. My blower motor fuse keeps burning out , what could be the culprit? I changed my fuse 3 times today mini #20 in my dodge neon, and yes the blower would work after each new fuse but only momentarily. Blower motor has nothing to do with the A/C. Testing the Voltage Output of the Blower Switch on the Heater Control Panel. ^ Yes it should still power off with the key out of the ignition. Average repair cost is $140 at 84,000 miles. New 14 gage wire. Also if you keep burning out the blower motor resistor, that is a sign the blower motor is on its way out. As we known,the main purpose of motor overload relay is to protect our electric motor winding from mechanical overload that can result the serious damage. Use the lower speeds if you do not get a new blower motor. and force any debris/leaves out through the blower motor hole, or try clearing with piece of coat hanger. A motor starter is just another name for a certain type of relay that is used to control a motor. It should come ON when you turn on the blower switch. The blower motor is rated at 30 amps so you would want to use a 40 amp relay. I replaced the fuse, and it blew again, so I went and got a new resistor. When the relay was energized it seemed to provide voltage but no amperage. If power is supplied to blower motor through the speed switch and blower motor resistor: Disconnect the electrical connector at the blower motor. I recently had the same issue except I had to replace my whole blower motor but it started out the same way as yours. Reconnect the blower motor speed control that you disconnect in the last step. Buy a 2004 Chevrolet Colorado Blower Motor Resistor at discount prices. I have my relay out and am wondering if you can tell me how to test it. Blower Fan Won't Stop - FAQs. The blower seems to run fine according to the neighbor. This article originally appeared on YourMechanic. The high limit switch shuts down the furnace at a set limit so a clog doesn't burn out the system. That worked for a good month or so, and as of Friday night, (two days ago) I was having the same problem once again, where my blower motor was kicking out. The specific diagnostic procedure will vary depending on your particular vehicle. (Melted switches and wires) Adding a relay between the switch and the blower motor resistor WILL fix the problem. Thermostatic Wiring Principles by Bob Scaringe Ph. Choose top quality brands AC Delco, API, Dorman, Forecast, Four Seasons, Standard Motor Products. When a blower resistor is faulty, the fan will usually operate at one speed only, usually the highest speed setting possible. Then when you switch to the highest speed, the relay is flipped and disconnects the lower power line and connects the 30 amp line directly from the battery to the blower motor. Both of my Pathfinder are 2002's -- some of the earlier cars actually had a blower motor that was prone to fail when the motor failed it would short out the. It was made for '86-'92 vans but the wiring is perfect for a pick-up. Furnace Blower Motor Keeps Burning Up We are now on our 4th motor and have a stumped AC tech. I have replaced the resistor, pig tail and blower motor all new less than a year ago. If I'm correct, then you'll need to replace the indoor evaporator as well. There is a kit to fix the switch burning out. So, i ended up replacing the stock resistor with a replacement. You'll have to decide on your own if this is within your skill level. One of the first symptoms of a problem with the blower motor relay is a blower motor that does not function at all. What would cause an hvac blower motor to burn out? Best Answer: Actually the amp draw on a motor goes down due to the fact that it is moving less air, it's doing less work in the scenario. After reading a bit, it sounds like the blower motor relay is bad. Blower motor fan switch. My issue is I have the blower motor working however the ground wire that is in the harness isn't grounding so I grounded the blower motor to the body of the car. Basically a relay is a little switch that engages a big switch that won't melt. save Save BHEL 600 MW Soot Blower For operation and reverse the blower. With this, it is recommended to lubricate your blower motor regularly. The blower motor and fans spin, pulling air from the Air Return and generating a stream of air through the Heat Exchanger and out the Ducts. After reading a bit, it sounds like the blower motor relay is bad. They burn gas in a combustion chamber which gives off heat. If your home doesn’t have air conditioning, it may rely upon a dehumidifier to reduce uncomfortable, muggy humidity in room air. i have an 85 corvette i cant get the blower motor to turn on i can feel heat but no blow shitty right. If the furnace is receiving power, turn up the thermostat, and see whether the blower motor starts within the next few minutes. You don't want to have to go back in if one fails later. HVAC Furnace Repair: Does Your Furnace Smell Like It's Burning? If you smell something burning the first time you use your furnace, it might not be a problem. Safely install the impeller on the motor shaft, but do not turn on the blower until you have attached ducting and cyclone. The vehicle was taken to the dealer where it was diagnosed that the blower motor resistor needed to be replaced. Note that the limit switch has nothing to do with the thermostat. Customer is very upset since dryer was delivered on Dec 19th and unit never worked. Over a period of time the resistor and usually the connector overheat and blower operation stops in some or all speeds. My headlight relay got into a bad habit of getting real hot. The most recently reported issues are listed below. 4 Steps To Troubleshoot Furnace Blower Motor Fan And Repair Replacement Guide When it comes to the cooler months of the year, heating becomes essential and if, after not being used for some time, you go to turn on your furnace heater, only to find that no heat or air comes through the vents, then, as explained in the HVAC Blower Motor Guide. Yeah, we don't know the OP's skill level to know if it's a good idea to DIY or call in an expert. 2009 Mazda 5 blower motor diagnosis I did a bunch of research, want to share what I learned here because I didn't find the answers so easily in other places. Heater Blower Motor Resistor - What is it? Find out on Cars. also found burt wire to resistor connector. As I recall from my '77 Camaro, the plug-in on the blower motor relay should have one large red wire in the connector, plus smaller ones. When your resistors begin to burn out, it's only a matter of time until you lose the lower speeds until only the maximum speed works. Tighten the shaft nut and bolt the bracket to the blower, taking care to keep the motor centered in the blower so it does not interfere with the fan. is it a switch or a fuse or a blower motor? 40 Answers. Blower motor resistor and relay keep burning out. From my experience, it is rare that the blower motor and blower motor resistor go bad, so I would point my finger at the relay. I understand that a lot of cars use this same technique. this time around i was digging in myself to see what the heck was going on. written by Randy Mullins. I`ll ty the new out,when it comes in next week, and see if it makes any difference,it has a lifetime warranty, with the relay. My truck is a 2004 freightliner century with a cat C15. If it's the 10A fuse, then the relay is bad (try swapping with another one same type). The first thing to do is check the relay or voltage from the board. I then went to Ebay. Take a look here in our '03 X Member Journal. Currently on vacation in frozen Nothern Michigan and am now without a heater/defroster (no air movement from the blower). I finally found the simple solution and ultimately the actual cause to the issue of the blower resistor burning out and over-heating the plug wiring - The blower motor itself is the culprit! After years of replacing the blown resister module 3 to 4 a year, I finally bit the bullet and bought a new blower fan/motor. When the blower motor relay does begin to fail, the vehicle will usually display a few symptoms that alert the driver of a potential problem that should be serviced. 1994 toyota pickup ac / heater blower motor relay keeps burning up. com As the relay is the switch that supplies current to the blower motor, if it fails internally, then power will be cut off from the blower motor circuit, causing the motor to no longer function or blow any air from the vents. From the switch, three wires run to the resistors under the hood. Order Ford F150 Blower Motor Resistor online today. If it's the 30A fuse, then your blower motor is probably going (or you have a short in that line). Have you tried removing the wiper arm/blade to see if the motor then runs stops as appropriate? Motor powered without moving the wiper arm implies that the arm slips on the axle - or the motor is blocked. If the blower motor resistor harness is burned, what do you do about it? pull the wires and repin into a new plug? Why are they notorious for burning?. Check and correct: adequate ventilation to support all boiler room equipment, high furnace pressure, burner head setting, full opening of burner air damper, debris obstructing air damper, correct air guide or inlet sleeve, blower wheel not tight on motor shaft, correct blower wheel adjustment, combustion air leakage from burner, scroll. I want to make sure I dont put the new one it and blow it as soon as I hook it up because something else is wrong. The blower motor resistor keeps melting the wire plug to the resistor. When the blower motor relay does begin But ads are also how we keep the garage doors open and the. The resistor went, so I replaced it and then the resistor went again and then the blower motor. The replacement of parts in the blower motor system are some of the easier repairs to perform on the automobile. It will run until your battries run down. A relay is often used with computers to control analog devices. Not good stuff. Well the latest issue was a burning electrical smell and no air movement lol, but seriously I am in northern Manitoba and the ac can't keep up on a sunny day I can't Imagine Florida. If the relay is working I would suspect that the blower motor is not working. The rear defroster doesn't work at all. Choose top quality brands AC Delco, API, Dorman, Forecast, Four Seasons, Standard Motor Products. If you’ve replaced a blower motor resistor and that replacement has failed, it’s time to conduct an amperage test on the blower motor. If it's the 30A fuse, then your blower motor is probably going (or you have a short in that line). I have a 1996 Buick Lesabre and the blower motor only works on high and I did replace the resistor. The AC blower motor draws much more current at high speed compared to the heater blower, so the factory A/C wiring includes a relay to operate the fan on high, so too much current doesn't go through your fan switch and burn it up. Blower Motor Malfunction #1 Before you spend a whole gang of dollars, try this: Have your mechanic take out the resistor pack that controls the AC speeds. Fasco D701 5. DO NOT remove the bolt at 7 O?clock, but rather loosen it and back it out about ?-inch. The second problem SOUNDS like-- The Infamous Blower Motor problem. Just the blower is intermittent, not the compressor. I made the decision to replace the blower motor with a new one to hedge my bet against doing this again. I ordered mine from a Napa Auto Parts by telling them I need a blower motor relay, part #2523079942. Repeat the tests just to make sure of your test results. So the motor was going and causing the resistor to fail. After the blower motor is turned on, the airflow switch is monitored. Fuse box located. On my 1993 Legacy, the blower motor relay is located underneath the driver's side dash panel, where all the wires and junk are. Expert advice on how to repair a dehumidifier that doesn’t work, does a poor job of dehumidifying, or has other problems. I speculate that it would sometimes work on high only because the higher voltage bridged the gap at the bad ground contact. If all looks good suspect the blower is pulling to much current. RE: Blower Motor dead IP: Logged Message: repalced blower motor and resistor but still not working. The blower motor itself is about a month old. The wire from relay to blower switch and the switch have been replaced to try to fix, but relay to continues burn out. The blower motor resistor is the component directly responsible for controlling the blower motor fan speed. I want to switch out the motor to a multi or variable speed to help deal with the cycling on low burn. The blower motor is a D/C electric motor driven by varying current supplied by the blower motor final stage unit. The blower motor is the component that propels a "hamster-cage" type of fan, which is responsible for recirculating the air inside the car's cabin. it can eventually wear out. the new one you get at the dealer has the revised technology on the boards that keeps the unit from burning out. Then when you switch to the highest speed, the relay is flipped and disconnects the lower power line and connects the 30 amp line directly from the battery to the blower motor. Repeat the tests just to make sure of your test results. The Dodge circuit is very different than the GM set up. So the motor was going and causing the resistor to fail. Replacing a blower motor would not require breaking the refrigerant loop, so I suppose it would be possible to buy the part and replace it yourself. If the blower motor does not get power, I would expect that would prevent at least the AC from engaging the compressor clutch. If you remove the blower motor power transistor, and retest the blower motor power harness you get 0V as you would expect. So over time, water was leaking back into air system, draining down into lowest point (yes, the blower motor casing) and causing blower motor to burn out the resistors and melt the resistor plug (but the blower kept running - poorly). I checked the fuse, and it was blown. I have a 1998 Ford Taurus. It should come ON when you turn on the blower switch. I have replaced the resistor, pig tail and blower motor all new less than a year ago. Replacement of the AC fan motor is a simple job requiring only a few tools. But ads are also how we keep the garage doors open and the lights on here at. my hvac (heater & air handler in attic) keeps blowing edison fuse every few months. I mounted the resistor pack on the front side of the box, only because of clearance problems with the battery if mounted on the rear. Use a jumper wire between the Black/Blue Stripe wire and the Black/Yellow Stripe wire. Since the voltage is changing, I know that the blower motor power transistor is probably good also, but since there are signs of burning in the connectors so, I'm going to replace the blower motor power transistor also. After all the mumbo jumbo it basically says that the blower motor for the heating system may not function on certain settings or not at all due to the terminals for the resistor module being corroded. Not good stuff. With that said, if the blower motor doesn't work at all it's also common to find a defective blower motor relay. Last year my blower motor kept going in and out so I took the the ground piece that was bolted to the fender on the right side and sanded it down like most people said to do and I put it back on and it worked for a year well Im starting to have the same problem again where you turn the knob to 0 and the ac light is still on like there is a ground issue. Whether you work in HVAC or you're taking part in some simple repairs around your home, an important component when it comes to your HVAC system is the internal fan within the industrial system. Like any moving part, the motor occasionally needs some TLC. Peugeot 307 - Heater blower motor - Peter. Hope this made sense. If the blower motor is getting power but the motor still won’t run, replace it. The plug to the switch had gotten hot when the resistor went out and burn one of the wires in the plug. It was $26. Not a purist solution, but I like to control the blower independently anyway- e. This means after replacing the blower motor resistor, check if the blower motor runs freely and doesn't make any noise. Question: Blower motor will not run on high have replaced motor and resistor. The blower may be simply too old, in which case it may need to be replaced. The radio/infotainment interface on my 2015 is just so antiquated and it's starting to bother me. But the heat still comes out very hot just on low it seems no matter how much I turn the fan switch. One fresh air in the other hot air out ! When the engine is on the blowers are always on ! If there is a any smoke due to oil burning or ant other heat problem the engine air out vent will thell you the story ! The high speed in line blowers Defender or Worst marine!. Not a purist solution, but I like to control the blower independently anyway- e. So we took out the relay, only to discover that one of the spade connectors in the relay, the one with the # '6' on it, was stuck in the fuse/relay block. Over time, a blower motor may become noisy as the motor electrical contacts wear. it does work on all other speeds. I have replaced the resistor and ruled this out. My fan blower resistor swith keeps burning out on the lower speeds on the switch. The blower motor gets power from sub fusable link #6 to fuse #16 in the drivers footwell. I noticed a little bit of what looked like a bit of a burn mark around where one of the terminals plug into the relay. I`m going to keep the motor i have----at best i`ll have a backup blower motor in case one quits on me----and. It is p/n 4723982. So, i ended up replacing the stock resistor with a replacement. The blower motor resistor is the component directly responsible for controlling the blower motor fan speed. I have a 2006 Jeep Wrangler right hand drive. The first one quit, I replaced it, then 4 months later it burned up, now, I think it is going out again. The relay was mounted on the cowl above the blower motor. Blower motor relay for '88 Chevy suburban won't stop burning out!? Whenever I hook up the alternator, and the power wire for the battery indicator and dashboard, I burn out my blower motor relay, and the dashboard and ignition cease to work. The blinker relay has been acting up and I have to wiggle it every now and then when the blinkers stop. The blower motor bushings wear out in time, causing the motor to pull more current than the switch can handle. Has anyone else run into this Ideas. got my car back last friday turned out to be the blower motor relay it a 29 dollar part problem is its hard to find its back underneath the heater itself cost me two hours of labor to find out that what it was if u r good with cars u should be able to find it. The only way to determine which component has failed is to grab some basic diagnostic tools, access the blower motor, and check whether it is receiving power or not. Replace the blower motor AND the resistor at the same time!! The motor is drawing too much current over the resistor circuit!!AND replace the Blower Motor Relay! It's cheap (about $12) and when you replace all 3 components at once, you should get many years of reliability out of the repair. I have replaced the resistor, pig tail and blower motor all new less than a year ago. The blower resistor is located on the passenger side of the … Continue reading "2005 Chevrolet Silverado Blower Inop". Service Clinic: Why and How to Test HVAC Blower Motors Keeping motors clean is an important step. Motors are sized based on the blower wheel size and if they installed a motor that did not match the blower wheel then it would burn up. You plug it into the motor and hit a button, and it tells you if the motor is good or bad. Whats the problem? Bad harness?. BLOWER MOTOR RELAY The front blower motor relay is located in the Intelligent Power Module (IPM), which is in the engine compartment near the battery. Re: blower motor keeps running whether car is on or off Post by mrbrian200 » 19 Nov 2017, 19:37 I'm not expressly familiar with the inner workings of the electrical portion of the ignition switch, however, when I first bought my S60 after it had been basically sitting for the better part of six months I noticed something in the ignition switch. To fix a broken blower motor, you will need the. Fuse box located. 1994 toyota pickup ac / heater blower motor relay keeps burning up. Four Seasons is a leading automotive aftermarket supplier of air conditioning and cooling system parts. Took my climate controls out and the fan continued to work, ended up pulling the 40amp fuse in the engine bay to shut it off so I don't kill my battery. 3 months later my blower motor died on me. I can't visually find a shorted wire from the 240 side back to the blower motor nor at the blower's capacitor. 2 carrera heat blower relay 911 618 153 00 Is there a way for me to check it ? thanks _____. Order Ford F150 Blower Motor Resistor online today. Overload relay will act when in the burning out of the motor when a. 22 Answers. You have an electrical or mechanical problem in the blower motor/circuitry in near vicinity causing it to overheat. couple of years ago the control board fried, had ac guy come replace it, he said the motor might be on its way out. 2006 Jetta TDI Blower Motor and resistor fix So, I just wanted to pass on my experience with this situation. And then they woudl say that the extra load of the fan on the relay that turns on the compressor was indeed the cause of the. The specific diagnostic procedure will vary depending on your particular vehicle. Fuses in the vehicle passenger compartment CR-V 2002-2006. After removing the relay, flip the tray and remove each wire (tape the lug & mark the position). See the fuse and relay layout map molded into the inner surface of the IPM cover for front blower motor relay identification and location. Probably best to call an expert as even changing out a motor can get complicated if you don't know what to get at the parts house. BLOWER MOTOR RELAY The front blower motor relay is located in the Intelligent Power Module (IPM), which is in the engine compartment near the battery. This test is important because the blower motor could run when we apply battery power and ground in the next test, but could be blowing out the blower motor fuse, or burning out the blower resistor and/or blower switch (due to a high current draw). If the new motor has oil ports, make sure they are facing out and are not blocked by the bracket. The only other thing I can say is try not to run the fan at the highest speed or keep it down as soon as you can. About a month ago, my blower stopped working on certain speeds, then it quit working all together. Think this is covered? if not do you think i have to replace just the connector or the whole wiring and the blower?. It should be noted that if the run capacitor has polarity, the terminal that is marked should always be wired to the ‘r’ terminal of the motor. I have a 1998 Ford Taurus. Soft connection among these gears is very important to make sure your blower motor is always working well. From my experience, it is rare that the blower motor and blower motor resistor go bad, so I would point my finger at the relay. The resistor of the blower motor is responsible for transferring the electrical current that's required to move air through the vents of vehicle. The switch is cool as a cucumber. The first one quit, I replaced it, then 4 months later it burned up, now, I think it is going out again. Re: No High Speed Blower Fan 08-15-06 03:12 PM - Post# 985786 In response to Bill K. There is an A/C high speed relay retrofit kit that AMC offered. YourMechanic. The heater fan only works in high speed and is very loud and someone told. With that said, if the blower motor doesn't work at all it's also common to find a defective blower motor relay. You may pretty easily exchange the blower motor by yourself, it's not too challenging. It is easy to wire a thermostat to your furnace blower with a few tools and a little time. Replace the blower motor AND the resistor at the same time!! The motor is drawing too much current over the resistor circuit!!AND replace the Blower Motor Relay! It's cheap (about $12) and when you replace all 3 components at once, you should get many years of reliability out of the repair. Blower motor has nothing to do with the A/C. My fan blower resistor swith keeps burning out on the lower speeds on the switch. With that said, if the blower motor doesn't work at all it's also common to find a defective blower motor relay. The fan stops when the melted plastic makes the fuse no longer contact the fuseblock. Fasco D701 5. Good advice from Vince. Was your blower motor GOLD ? I just replaced my 2 blowers to the faster blowers. The resistor fries so I only have low and high speed again on the blower. The unit continued to work fine but now the blower motor continues to burn up. Blower Motor Malfunction #1 Before you spend a whole gang of dollars, try this: Have your mechanic take out the resistor pack that controls the AC speeds. Openbay is an online source that connects you with multiple auto service professionals nearby who will compete for your auto repair and maintenance business. Sometimes, a blower motor resistor might fail due to problems with the blower motor itself. DO NOT remove the bolt at 7 O?clock, but rather loosen it and back it out about ?-inch. got my car back last friday turned out to be the blower motor relay it a 29 dollar part problem is its hard to find its back underneath the heater itself cost me two hours of labor to find out that what it was if u r good with cars u should be able to find it. The next time you replace the blower motor resistor, be sure to do so as directed by Dodge. Also if you keep burning out the blower motor resistor, that is a sign the blower motor is on its way out. Blower Motor Resistor Reason Why It Get Burn Dodge Stratus 2000 Misael Bautista. The blower motor may be burned out or worn out. 99 and delivered to my local store on the same day I ordered it. Upon close examination it is the power running to the motor that is getting hot and causing it to blow. The function of a heater blower motor for Chevy Malibu is to provide air conditioning and ventilation to the interior. Re: No High Speed Blower Fan 08-15-06 03:12 PM - Post# 985786 In response to Bill K. Did all the checks - 40 amp fuse good, relay relaying power to the fan, but no fan. I am wondering two things: First, is there a way to test a blower motor to know if it is in fact faulty and thus the cause of the relay burning out?. yes the new unit is expensive, about 350. From the fure it goes to the heater relay pin 1. RockAuto ships auto parts and body parts from over 300 manufacturers to customers' doors worldwide, all at warehouse prices. Since the blower motor draws over 5 amps this would cause the fuse to blow if hooked up with the blower motor. These occurrences may result in an inoperative blower motor, or result in a blower motor that functions only on certain settings. He said the motor needed to be replaced again. If the blower motor still works on high, but will not work on any other speed, it usually points to a bad blower motor resistor. Connect a fused jumper lead between the blower motor relay socket pin 30 and pin 87. Notice: Undefined index: HTTP_REFERER in /home/baeletrica/www/8laqm/d91v. 1st was to measure the current in this York. Blower Resistor Circuit Descriptions. Bookmark this automotive AC blower page or share. Hello! Please help! I payed out a big amount (probably foolishly) last year in April in order to have my AC Blower motor replaced. I took the fan motor out and tested it and it runs … read more. I’m surprised, after digging out a wiring diagram, that there’s only one fuse and no relay in this circuit. Last year my blower motor kept going in and out so I took the the ground piece that was bolted to the fender on the right side and sanded it down like most people said to do and I put it back on and it worked for a year well Im starting to have the same problem again where you turn the knob to 0 and the ac light is still on like there is a ground issue. I started my car up and it worked like new again. Safely install the impeller on the motor shaft, but do not turn on the blower until you have attached ducting and cyclone. I have a question, and am wondering if anyone else has the same problem. JEEP CHEROKEE Blower Fan Relay Keeps Burning-up The relay on my 92 cherokee for the blower fan will not last more than a week or two. Four male spades. Chased it down to the relay in the under hood fuse block. So it turns out that the blower relay was bad ( 5 terminal ). cheap replacement from Autozone / Advanced etc. However, it wasn't the configuration of the circuit that's causing the blower motor resistor to overheat. I replaced it because I thought the old one was drawing too much juice because I ruined the motor balance when I cleaned it last year. 1997 K2500 keeps burning up HVAC Control boards, the control unit in the dash. also found burt wire to resistor connector. 6-Inch Direct Drive Blower Motor, 1/2 HP, 115 Volts, 1075 RPM, 4 Speed, 7. I tested for power and it is still receiving power from the relay. Generation 1-4 Taurus, Sable Platform (1986-2007) Maintenance and Repair. If there is a battery, check if it is working properly. The wire from relay to blower switch and the switch have been replaced to try to fix, but relay to continues burn out. My number 5 setting quit working so I got the new resistor and it fixed the problem. So it turns out that the blower relay was bad ( 5 terminal ). I read lots of posts on this site and others, all saying when your interior blower doesn't work, or only works on high, then you need to change out the resistor. REFRIGERATOR WHIRLPOOL WRX735SDHZ01 "Inspected unit seal system realized installed uv dye when i open thee systme wasn't any gas comig out from the unit, installed filter dryer uvdye. long story short, I'm not an electrical expert and can't figure out why i keep frying resistors. Bookmark this automotive AC blower page or share. However, there are a few vehicles out there that make it extremely difficult. A Time Delay Relay is energized and passes battery DC power to the blower motor. I'm sure the speed will need to be tuned back up when it's time for the central A/C to be used. Replacing just the cap on a fractional HP blower motor, even if it is bad, won't solve the problem completely. It needs to be attached to be safe and to protect the motor. The high limit switch shuts down the furnace at a set limit so a clog doesn't burn out the system. I run the fan on High all the time and burn out a fan speed switch about every six months. Make sure the cabin filter is clean and no obstructions to the blower motor. Order Ford F150 Blower Motor Resistor online today. The transformer should be connected to the control board usually labeled P1 and P2 or P1 and neutral. Good advice from Vince. 5 to 3 hours depending on unit location and part availability. one spade feeds the blower cut-out relay (and resistor pack - blue/white wire slaved off blue/orange) for those with a/c. the high blower speed works through a relay. got my car back last friday turned out to be the blower motor relay it a 29 dollar part problem is its hard to find its back underneath the heater itself cost me two hours of labor to find out that what it was if u r good with cars u should be able to find it. Its' just in front of the firewall in the center, above the engine inside a plastic shroud. One of the things we noticed early on was that the blower motor didn't work in position 4 which as I understand it, is powered by the A/C relay. The air is taken back to the blower through the return air ducts to the furnace and is then returned to the home through the supply air ducts. There is an A/C high speed relay retrofit kit that AMC offered. They use 12 volt power to run the blower and provide ignition rather than 120 volts, but the principle is the same. A fuse-link doesn't operate the same as a fuse. The 2005 Chevrolet Trailblazer has 22 problems reported for blower fan motor stopped working. The blower resistor may also be bad, or the relay, or the switch itself. The blower relay is on the driver's side, way in there, beside the rear accessory power relay. There are several symptoms that appear when the resistor of the blower motor is going bad. When this happens the inside of the Jeep will smell like burnt rubber and the a/c blower may not work. Time delay relay. The blower motor may be burned out or worn out. After I replace the relay I have all fan speeds then the relay burns out after about an hour. 1997 K2500 keeps burning up HVAC Control boards, the control unit in the dash. The airflow switch is checked to see if it is closed. Many technicians have great difficulty understanding how to properly wire a thermostat or how to replace a thermostat with a different thermostat. I just plug it in and push in the blower door switch and it burns up. You can build an inexpensive solar heating system that only costs $30 out-of-pocket. The blower motor continues to run to force air through the boiler for the post-purge period. If the motor comes back good, you could try a new blower motor relay($5) But most of the time it's the motor itself going bad. 7 Amps, OAO Enclosure, Reversible Rotation, Sleeve Bearing. Frame is a designation that helps provide critical motor dimensions, such as shaft length, diameter, height, and mounting pattern. That is why the resistor keeps burning out. ok ive been reading on the forum and i know one of the other guys had a burnt connector end on the relay part not on the actual connection to the blower motor? My question is i have bumper to bumper warranty on my truck. Blower Relay. I then went to Ebay. The resistor fries so I only have low and high speed again on the blower.