Save my name, email, and website in this browser for the next time I comment. A failed blower motor resistor can cause issues with the operation of the entire heating and air conditioning system.  In her downtime she enjoys backpacking wherever her boots will carry her, rock climbing, experimental theatre, a crisp rosé , and showering love on her 2001 Sierra truck. motor resistor assembly will take care of the problem. There may be no airflow at all, which could be a sign that the resistor has completely failed, the. from the blower box, unplug the connectors from the blower motor resistor � Since the motor draws so much current, a bunch of current goes through the resistors. � How can the blower motor housing be cleaned out in a Lexus RX350? When they fail, they supply either too much or too little current to a component. Gallery In older cars, the heater blower motor resistor was mounted under the hood on the firewall. If you get your head down on the floorboard and look up, you will see the 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. motor resistor assembly. The 5.0 out of 5 stars 9. � Failing Oil Pressure Sensor? Brake cleaner worked on the blower wheel. An OL reading on a multimeter likely indicates a full break in the circuit, meaning the resistance is too great to read from one test to another. 2002 Toyota Tacoma. coming from the vents. Knowing more about how it works can help you identify the signs of a malfunctioning resistor. hi can someone help me out?my blower motor only works on high. A new blower motor resistor will cost you around $20 at the dealer. as a blower motor ages and wears, it can draw more current—more current than the blower motor resistor was designed to handle. Help Lemon Law Here you can see the blower motor and the blower motor resistor. 1G 3.0L Engine Swap A failed blower motor resistor can cause issues with the operation of the entire heating and air conditioning system. � Before you begin, make sure that your battery is disconnected or at least the In this video I explain and test a bad blower motor resistor. i have an issue with the heater blower motor resistor block connector(its broke), and it has once again shorted out my blower resistor leaving me without heat. The blower motor resistor is a single part, often with several possible pathways for current flow that provide more or less resistance, depending on the demand from the dash setting. Can I just buy a used heat sink from prior year models (from ebay? Automotive expertise from NAPA AUTO PARTS. Which means a whole lot of heat. Since the resistor coils are mounted in the air duct (to help the disipate the heat generated) they are prone to corrosion. The more power supplied, the higher the fan speed and the stronger the airflow. i know i should replace the connector and resistor, but i was wondering if i can safely bypass the resistor? Knowing more about how it works can help you identify the signs of a malfunctioning resistor. � In order to clean the housing, the blowing motor under the dash will need to be removed. Subscriptions Resistors are used in electrical circuits to lower current by, you guessed it, resisting flow. i smell something burning in the vents.i try to clean the blower resistor and all the coils from the reisitor were making contact.and the resistor it self was kind of burn.i clean it out and my blower motor was working on all speeds.but i notice the burning smell again so i notice that the blower resistor was getting so hot it … A blower motor resistor is an adjustable resistor. Remove the two screws (8mm?) remove all retaining clips, move the ducting cover to the side. Your vehicle’s heating and air conditioning system consists of many parts working in unison to produce your preferred air temperature. Within the blower motor resistor assembly is a non-user serviceable thermal fuse. Sometimes corroded connectors will cause the failure. Most of the time, simply replacing the blower motor resistor assembly will take care of the problem. Your email address will not be published. � Now the blower motor is going to be sitting straight up and down under the dash. In that case, the blower motor resistor will fail repeatedly. TireCalc If you start at the blower motor, and check resistance in the circuit, you will find the problem … pulled, you should be able to remove the clips with little effort. 1G/2G Compare After all, I want to make sure you don’t come back! Oil … The wire harness (2) plugs into the blower 9 Team Finish Seventh at Phoenix. The reason that the blower only works on high is because when you select high on the blower motor switch- it sends the current directly to the blower motor, bypassing the blower motor resistor pack. Plug your replacement blower motor resistor assembly into the Use a soft bristled brush to brush off fan motor and vacuum the outer fan motor ends. When you get the motor out, take it with you to the parts store, because there are 2-3 different motors that fit this car and it just depends on what was on the line at the time of assembly. The blower motor resistor is a small electrical component that can cause noticeable issues with the passenger compartment’s air when it fails. The tube on the right is the housing of the blower motor. These are balancers and care should be taken not to damage or remove them. blower motor resistor assembly is a non-user serviceable thermal fuse. The fan speed can be changed either by switching the blower resistor resistance mechanically, using a rotating lever, or electronically by the air conditioning system. Some of these parts will (hopefully) last throughout the life of your car, but others are more prone to wearing out and need replacement. Required fields are marked *. � took the entire can! appropriate wire connectors until they snap into place. � HVAC Repair It will be located between the heater and air conditioning control knobs and the blower motor itself. When it fails — usually due to corrosion or overheating — you may notice a few things: Take time to determine the cause of your airflow woes before replacing parts. The motor itself is very low tech. NOTE: DO NOT OPERATE THE BLOWER MOTOR WITH THE RESISTOR OUT OF THE BLOWER BOX. Noisy as can be, but works otherwise. It would be fine... except blower motor resistors don't "wear out"; they stop working altogether, suddenly, when the resistance wire inside burns through. Chat Check out all the climate control products available on NAPA Online or trust one of our 17,000 NAPA AutoCare locations for routine maintenance and repairs. Within the blower motor, blower motor replacement, climate control, climate control maintenance, electrical system, heater, heating problems, multimeter. Once you have removed the resistor assembly On the blower wheel fins, you’ll find metal clips. All Rights Reserved. Static resistors are designed to supply current at a constant level under specific resistances. This is a dead ringer symptom of a bad blower motor resistor, not a bad speed switch. WITHOUT THE COOLING PROVIDED BY THE BLOWER, THE RESISTOR WILL REACH CRITICAL Recalls/TSBs There are wiring harness that is shown above. Place a voltmeter across the two pins. 99. Replace the resistor. The blower motor resistor can usually be found under the dash as well. The most common symptom of a faulty blower motor resistor is a blower fan that only works on one speed, usually high. �. 5% coupon applied at checkout Save 5% … The resistor pack is located beneath where the motor was and is now readily accessible. This is normal, and is caused by the burning off of One TEMPERATURE AND MAY CAUSE BURNS AND WILL DAMAGE THE RESISTOR. Air flows, but only at high speeds, and other settings no longer work. blower control is in the off position and they key is removed from the Links A trained technician can perform a thorough inspection of your blower motor and let you know if it needs to be repaired or replaced. Once you If the motor runs, locate the ground connection and clean it. It works by adding resistors in line with the motor. Some basic hand tools and a vacuum cleaner will be required to clean the area after removal. Usually a bad or failing blower motor resistor will produce a few symptoms that can alert the driver of a potential issue. Since I have stopped using the low setting, I have not blown a BM in 18 months. Tint Laws For example. 1. way to remove these clips is to get a pair of small tip needle nose pliars and Your blower motor may overheat because of a number of reasons. This can be annoying, but troubleshooting is easy. The blower motor assembly should slide out, allowing you to slip off the HVAC vent connections. assembly by gently pressing the plug release clips and pulling away from the anti-corrosive chemicals off of the resistor coils. IF cleaning it, do not get the blower motor in any liquid. � IT was nasty! Today’s modern vehicles normally locate the heater blower motor resistor inside a ventilation duct near the fan, where the built-up heat from the operation of the heater blower motor resistor can … Hvac blower motor resistor (lower). the low position, as this is the position that has the highest resistive load. If your car’s blower has only 4 or 5 different speed settings, it likely uses a simple electric resistor to control the fan’s speed. Single Wiper Mod � back into the blower box and secure it with the 2 screws, do not over tighten. About Stratusphere Remove the screws, and swap out the resistor module. A new Blower Resistor for these cars can run upwards of $75 to $95 plus shipping depending on where you buy it. If you continue to Once the pin is The heating and air-conditioning system uses several resistors to supply the desired airflow by sending power to the blower motor. Your email address will not be published. Members This is also when you can inspect the condition of the motor, clean if needed and lightly lubricate it. Buy Decals Reconnect the electrical connector and you’re car heater blower motor is back in business. With just a multimeter, you can find out if it’s time to get a replacement. Calendar $25.99 $ 25. The blower motor resistor is a small electrical component that can cause noticeable issues with the passenger compartment’s air when it fails. Remove the bolts, and pull the motor out. Dirty cabin filters restrict clean air flow through the vehicle's ventilation system, hampering optimal operation of the defroster, heating and cooling systems. Fortunately, you can check the state of the component through the blower motor resistor test. � Step 3: removing the blower motor resistor of your Volvo 740 or 940 This is what allows you to have multiple speeds. � that hold the blower Here Are the Warning Signs, 6 Signs You May Have a Bad Water Pump On Your Hands, How to Dry Out Your Wet Car in 3 Easy Steps, Dead Car Battery? The easiest Then, if the resistor fails in the future, it will be an easy repair, without all the cutting off of the block design? The change in resistance then limits the current through the motor, which dictates the speed at which the blower fan works. Place the ducting cover back into place and re-insert the clips. Allow to dry completely. On the dash, each setting effectively represents a different current flow: When you select a low setting, you’re sending less power to the blower motor, which is achieved by more resistance, and when you select a high setting, you are sending more power to the blower motor, which is achieved by less resistance. If you came into the shop, I’d probably get you a new resistor for $35 and a blower motor relay for $25. � Disconnect the wiring connector from the blower motor to make sure there isn’t any corrosion or connection issues. Elliott, No. Caution — the fins are sharp so be careful. © Copyright National Automotive Parts Association. This is not meant to be used to service the Blower Resistor on models with Automatic Climate Control as that is a different type. Place two large straight pins in the plug of the blower motor but leave the blower motor plugged in. In the middle you’ll see the resistor (with a cable on it) and on the left is the heater radiator in its housing. Blower only works on high speed. Job done! A604/41TE Trans Info Now it’s time to focus on the troubles of the heater or resistor. Blair Lampe is a New York-based professional mechanic, blogger, theater technician, and speechwriter. � � Disconnect the electrical connector. pull the center pin out about 1/4" from the clip assembly. 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Diagnosing Blower Problems – No settings work at all: First check the fuse and all connections. These are clean, this is not the problem… On to the blower resistor. Replacement of each component varies in difficulty depending on the vehicle, but an experienced DIYer can do it at home comfortably. Articles/Reviews Its held in with 3 bolts. The reason you can do this is because the resistor gives you a way to regulate the speed by lowering or raising the voltage that is sent to the fan. A new blower motor resistor will cost you around $20 at the dealer. The fuse is what usually blows. � 3 or 4 push-pin type plastic clips that hold the cover in place. Place the assembly The higher the reading, the more resistance there is. � Do not pull of any balance clips on the blower wheel. � The blower motor seems to need a new resistor. Genuine Toyota Part - 8713835040 (87138-35040) Yes, you can run the blower full speed with direct power. experience a failure, you may need to replace the blower motor as well. Purchase a new resistor module at the auto parts store (usually less than $25). For more information on blower motor resistors, chat with a knowledgeable expert at your local NAPA AUTO PARTS store. assembly. fuse is what usually blows. Most of the time, simply replacing the blower Member Map I have the newer design (the full block shape). The blower motor resistor is located under the passenger side ducting cover Garage Under the passenger side of the dashboard is a carpeted cover you'll need to remove. This is a guide for repairing the Blower Motor Resistor on a Volvo 850/S70 with manual A/C. If it still doesn’t run, check the resistor and speed switch for continuity issues. A blower motor resistor controls the fan speed of the blower, so if you have a blower that’s stuck on one speed or doesn’t work on certain settings, it could be the resistor. that is under the dash (right above the passenger floorboard area). To remove it, pull forward and upward towards the front of the car. TAMKKEN Blower Motor Resistor 973-027 Compatible with Chrysler Voyager Town & Country Dodge Grand Caravan Nitro Jeep Liberty Commander Fit 5179985AA 5061587AA 4885482AC RU399. motor resistor assembly in place. To test a resistor or motor, you’ll need to know the basics of electrical circuitry and have access to a multimeter and the proper electrical specifications for the involved circuits. � Search i have kids and need some kind of heat to get me a few days untill i Dirt and grime can accumulate around the motor and prevent it from venting itself, causing heat to build up over time. FAQ 5. ignition. Blower motor stuck on one speed. Finally, remove the electrical power connector, which can be pulled out by hand or by carefully using a small flathead screwdriver on the clips. Once that's out of the way you'll see the blower motor on the RH side and just to the left of it right next to the frontwall is the blower motor resistor held in by two screws. For the first few minutes of operation, you will notice a slight burning odor ... Keep it Clean. � Resistance is measured in ohms and can be anywhere from zero to OL (open loop). Usually a bad or failing blower motor resistor … Second, check to see if there is any power at the blower motor. Blower; heater blower. thing I have learned after blowing 3, is to not use the blower motor control in Signs of a bad or failing blower motor only works on high blower... Has completely failed, the resistor for repairing the blower motor assembly should slide,... Power supplied, the blower, the more power supplied, the symptoms that can noticeable! 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Entire heating and air conditioning control knobs and the blower motor resistor will cost you around 20.  and speechwriter with just a multimeter, you will notice a slight burning odor coming from the.! They are prone to corrosion area after removal repairing the blower full speed with direct power where motor. The resistor cause BURNS and will damage the resistor and speed switch for continuity issues pack the! Usually less than $ 25 ) with little effort and vacuum the outer fan motor ends wears. A failure, you may need to replace the blower motor resistor assembly in place operation of the heating. Harness ( 2 ) plugs into the blower motor is going to used... Snap into place and re-insert the clips with little effort full speed with direct power the can you clean a blower motor resistor all. You can run upwards of $ 75 to $ 95 plus shipping depending on where you buy it clean. The burning off of the dashboard is a non-user serviceable thermal fuse information on blower motor and prevent it venting. To have multiple speeds air-conditioning system uses several resistors to supply current at a constant level under specific resistances to. Good way to rule out a bad blower motor resistor will REACH CRITICAL TEMPERATURE and may BURNS! Service the blower motor to make sure there isn ’ t run, check the resistor and speed switch continuity. Jeep Liberty Commander Fit 5179985AA 5061587AA 4885482AC RU399 the housing, the box. Current by, you guessed it, pull forward and upward towards the front the... Than $ 25 ) in business be annoying, but troubleshooting is easy 4885482AC RU399 damage resistor! Block shape ) buy a used heat sink from prior year models ( from ebay any balance clips the! Is now readily accessible you continue to experience a failure, you will notice a slight burning odor from... Second, check the state of the heater or resistor flows, but an experienced DIYer can do at! Soft bristled brush to brush off fan motor and vacuum the outer fan motor ends that alert...