blower motor not working on high speed

This is a dead ringer symptom of a bad blower motor resistor, not a bad speed … First, watch my video "How to Fix a Car that Idles Poorly." That saves a lot of time because you don’t have to refer back to the component locator or circuit locations. Replace the resistor. Pretty sure it is not the motor at this time. So I'm still having problems with my A/C. If you ignore the noise, the bearing will continue to wear to the point where the motor won’t start at all. Get back on the road. Blower motor only working on high speed. is not expensive and easy to replace. The squealing noise happens most often in the winter during cold startups and may disappear as the motor heats up. I am competent on all aspects of working … You may just be able to wiggle the plug. I read in the forums that the resistor pack is messed up. Make sure the ground side of the high speed relay is working. It is likely NOT the blower motor itself. This may also cause the blower motor to work intermittently. This can be a bad blower motor resistor or a failed speed switch. Run a fused jumper from the battery to the power side of the motor and connect a temporary grounding jumper to the other motor terminal. Ok-today I went out to the 2006 TDI only to find that my blower motor only worked on high (4). See the wiring diagram for that setup below. or something else any help appreciated thanks john What size truck? If you see battery voltage in the connector, connect 1 meter lead to the power terminal in the connector and the other lead to the ground connector. One trick that I have seen work before is hitting the reset button which is a small hole about the size of a pen head under... Hi, it sounds like you may have a injector that is shorted to ground or an injector cable that is shorted. You can test them with an ohm meter. I have a 1995 Chevrolet Suburban that the a/c fan speed works on every position except high. The Oldsmobile Oil Life System indicates when and what service your car needs. The old motor that I removed was slightly rusty (exposed metal that could be seen) and did not spin freely. Is relay and … There are several signs that you can look for to tell if your blower motor might be on its way out—for instance, if your HVAC blower does not operate at different speed settings or doesn't work at all, that could be a sign the motor is on its way out. If you don’t see good ground, locate the ground connection and clean it. Many, many times a car or truck will come into the shop with the customer complaining that their blower motor doesn’t work, or only works on high speed, etc. If not problem is either new speed … Vile mentioned that it could be a relay. So a half speed driver request will result in the blower motor controller pulsing the ground connection off twice as often as when the fan is running at full speed. If the fuse is blown, simply replace it and you should have all speeds. An engine that is not able to keep itself cool is at serious risk of significant damage. The blower motor side connections seem fine, no overheating and the bearing spin nicely. This is a symptom of a failing blower motor bearing. This is the most common failure mode. If the motor runs, locate the ground connection and clean it. I have checked fuses, replaced the resistor, and I have replaced the relay with no effect. Neither of those things fixed the problem. Also, sometimes a blower motor relay on your control board might be going bad and you might need a new control board. Why do you need to know that? If it runs, you’ve solved the problem. In most cases, their diagrams are right from the factory manuals. When the blower motor resistor fails, 1 of the 3 or all 3 first speeds stop working. See the wiring diagram below for a typical variable speed motor setup. The plug the connector back into the motor and check operation. Also, check the fuse for the control side of the high speed relay. July 5, 2016, 6:28pm #3 [b]It isn’t the resistor block. The only way to test and see if it is a blower motor relay would be to test with a voltmeter to see if the motor is getting 110 volts to the motor when it starts going off and on. technicians, Trusted mechanics, rated by thousands of happy car The TSB is... Hello there, many different things that can cause the transmission to shift hard. Blower only works on high speed. Reduced airflow also causes the blower motor to work harder, draw more current and that can cause repeat blower motor resistor failures. Hi There, I have replaced the black bosch relay behind the glovebox, the blower resistor and the blower motor and still cannot get the blower to work on high. Unfortunately, you’ll need a digital scope or scan tool to test those components, so your only option may be to replace the parts one at a time. This is a very common problem among many cars and all makes of stereos. When this happens, you may notice that you will not feel anything blowing out of the vents at all. 4 and 5 not working at the same time is likely two different problems, and most likely the resistor and the fuse. In the off state, the blower motor is effectively disconnected from the power supply. In those applications, the motor resistor reduces power for the slower speeds and the blower motor has a permanent ground connection to complete the circuit. Pricing: ---Eautorepair.net--- 1 month subscription $19.95 per vehicle 1-year subscription $29.95 per vehicle 4-year subscription $44.95 per vehicle ---Alldatadiy.com--- 1-year $29.95 subscription: additional vehicles $19/95 each 5-year $49.95 subscription: additional vehicles $34.95 each Which one should YOU choose? It works fine on levels 1, 2, 3. The motor should run on high speed. The bearing is not replaceable. After repair, on the way home, I selected floor heat and the blower motor was still only on high. Disconnect the electrical connector at the blower motor. Do you set the temperature and the system keeps that temperature or do you have to adjust the temperature up manually and then turn it down once the cabin heats up? On the low speeds, the fan … The resistor is located under the passenger side glove box. Instead they use a blower motor speed control or a power transistor. The relay is normally attached to the A/C plenum under the hood, close to the resistor block for the fan motor. High blower speed is run threw a high blower motor relay and fuse. Power seems to drop both to the fan and AC switch when set to high. Alldatadiy.com, on the other hand, uses the factory diagrams. Blower motors generally don’t fail out of the clear blue. If you have a three or four speed blower motor, remove the blower motor relay. In a situation where the motor doesn’t work on any speed, the most likely causes are: a blown power supply fuse, a bad motor ground connection, bad motor speed control module or a failed motor. Take off the air intake, then duct the rubber part that goes to the intake on the top of the engine... Hello there, thank you for asking about your 1987 Oldsmobile Toronado. If you get a good ground reading, the problem is most likely a bad motor. costs, Hand-picked, community-rated professionals, Explore nationwide job opportunities for automotive If it seems the fan is slow, the fan itself is most likely the problem. Asked by ericdc033 in La Porte, TX on . In this video I show the quick step by step process on how you can fix the interior blower motor not working on number … Yes, it is typical on those Hondas. Finally tapped on blower motor and it ran. A blower motor problem is easy to fix if you understand how your particular system is wired. There is a plug that plugs straight in from the bottom to the resistor. Car symbols, or dashboard lights, are a car service reminder. Hope this … Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing. If there is power indicated on high blower speed, but not low or mid range, the problem is the blower resistor. Since I had purchased an extended warranty, I took it to the local Monaco dealer to have the blower speed fixed along with other problems. The voltage for the fan high speed by-passes the resistor block. pn 1K0 959 263A. Testing your Ford vehicle's blower motor resistor to see if it's fried (or not), can be done with a set of simple multimeter continuity tests. If you’re tracking down a wiring issue, Eautorepair.net is the better choice. If you need to dig into your doors, dash or console, Alldatadiy.com is the better choice because Eautorepair.net doesn’t any interior or exterior trim or body part removal. Run a fused jumper from the battery to the power side of the motor and connect a temporary grounding jumper to the other motor terminal. This occurs because the faulty blower motor resistor is not able to control the current flow. The highest blower speed usually bypasses the motor resistor completely, so it’s not a suspect if the motor doesn’t work at any speed. This is a dead ringer symptom of a bad blower motor resistor, not a bad speed switch. Start by checking the blower fuse and HVAC controller fuse. If it’s good, refer to a wiring diagram for your vehicle and conduct these tests: Disconnect the electrical connector at the blower motor and jumper power and ground to the motor, bypassing all the speeds controls. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. The most common causes include: low fluid level, shift solenoids, torque converter, or the transmission linkage. The reason I’m not including the motor resistor as a suspect is because it usually only controls the lower speeds. I have a 2003 f-350 that the blower motor only works on high, meaning that when the selector is in any other position it does not turn on but once in high it blows on high speed. Replace the blower motor. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. This is something that would require first hand inspection for complete diagnosis. Also, does your blower motor have just a 3 or 4 speeds or do you have a variable speed motor where you vary the speed by turning a dial? The blower motor has no power when the selector is set to high. owners, Our mechanics make house calls in over 2,000 cities, Fleet Maintenance with certified mobile mechanics, The statements expressed above are only for informational purposes and should be independently verified. To obtain the requested speed, the motor controller rapidly pulses the ground circuit on and off. A blower fan is connected to the negative battery terminal (also called ground) on one end and to the positive battery terminal through a blower motor resistor on the other end. The blower resistor is connected in series to the blower fan motor. Find auto repair near me; … You may have a blown main fuse if the alternator is proven to be... Electric seats run on a track with motors that adjust it in the direction you choose. I would suggest getting a mechanic, such as one from YourMechanic,... Hi. If the motor runs, locate the ground connection and clean it. The reduction in blower fan speed is accomplished thru' resistors (inside the blower resistor assembly). Coming home from Az. The user chooses a fan speed by selecting a speed which then connects one of the resistors in the blower resistor pack. It gets hot and melts. If you have a variable speed blower motor, replace the blower motor speed control module. 1997 Buick LeSabre. I'd recommend disconnecting blower motor and check to see if yellow/blue wire is being grounded with switch on high if so replace blower motor. If you do see battery voltage, the problem is either a bad motor or a problem on the ground side of the circuit. The module uses that information to pulse either power or ground to the motor. In those applications, the HVAC control head is a digitally controlled unit and uses various sensor inputs to determine when to supply heat. The lower the resistance of the selected resistor in the pack, the higher the current that flows through the blower fan causing the fan to turn faster. after purchase in 03, all I had was high speed on the blower motor. Or, carmakers can opt for a motor resistor AND a high speed relay. When that happens, you lose that speed. Check for full airflow at the vents. Blower on high not working. I think your blower motor may be the problem, pulling too many amps in high speed causing blower motor speed controller to shut down. It’ll be located on/in the ductwork by the blower motor. A Haynes repair manual will show you where it is. Clean96noma might wont to check to see if blower motor has a high speed relay that could be you r problem and it is not the blower resistor,resistor only controls your low and medium speeds.Blksdime03 sounds like your fan clutch took a shit.Just my to cents. I turned the fan switch on high and wiggled the plug in on the controller switch, next to the air hoses, and a puff of smoke came from the plug … The blower resistor is connected in series to the blower fan motor. 2. The first thing to go is high speed. Disconnect the electrical connector at the blower motor. In most cases, the controller receives a digital input from the speed switch or HVAC control head. See the wiring diagram below for that setup. The blower motor relay supplies power to this motor when you turn the switch to "on" that can sometimes fail. This is usually the case after a blower resistor failure on one or more … If the motor stops, replace the relay. Examined the plug at the blower motor and found it a little corroded - cleaned it and everything works fine. mountainbike; Tester. high not working on blower motor. Optimize fleet uptime and compliance via mobile vehicle repairs, Partner with us to simplify and scale fleet maintenance, Over 25,000 topics, from beginner tips to technical Blower motor fan speed woes After reading the posts, replacing the motor and the resistor, my other problem ended up being the plug in on the vent controller switch. The resistor is what controls the speed of the blower motor, not the relay. Does anybody have experience replacing this relay and possibly have a part # that I can reference? P0128 code definition Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) What the P0128 code means The P0128 code means that the... Oldsmobile Certified Pre-Owned (CPO) Car Program, Understanding the Oldsmobile Oil Life System and Service Indicator Lights, P0128 OBD-II Trouble Code: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature). Check for airflow restrictions in the duct, paying attention to debris on the evaporator or heater core. Based on the driver’s input to the blower speed switch, the HVAC control head sends a digital signal to the blower motor speed control module. it is under the right side of the dash by the blower motor. Blower motor is drawing too much power. This sounds more like a problem with high speed fan relay. The control head then sends a command to the motor controller to change the speed to the driver’s preferences. guides, Check cars for recalls, common issues & maintenance Any help appreciated. You just remove the black plastic molding below it and then pop out of the old one and plug in the new one. I have replaced the resistor and the fan speed switch. If the fan is running with the switch on High, the relay is working. If it still doesn’t run, check the resistor and speed switch for continuity issues. So you may have high speed, but no lower speeds. If your blower only operates on its highest speed, chances are you have the series type of blower motor resistor. Heating systems with just 3 or 4 speeds use a motor resistor along with the speed switch to regulate the motor speed. A common symptom of faulty blower motor resistor is when the heating and air conditioning blower only operates at high speed and cannot be adjusted to low speeds. The motor should run on high speed. Blower … Decreased airflow causes the blower motor resistor to overheat and fail. Does this mean that the selector switch is bad or is there seperate windings for each speed? Blower resistors are made of several resistors with different resistances. February 27, 2011 ... February 27, 2011. needs a blower resistor. Variable speed blower motors don’t use a blower motor resistor. Check the cabin air filter for clogging. My car has an automatic transmission. If the fuse is good, and you still have no 5, the problem is probably in the switch or the wiring. The resistors are arranged in series to reduce the voltage in steps, depending on where in the series you apply power. no high speed On all systems, a failed blower motor is least likely. See the wiring diagram for that setup below. They include wiring diagrams and technical service bulletins. Use a multimeter to check for the presence of voltage in the connector with the key in the RUN position and blower speed set to HIGH. The user chooses a fan speed by selecting a speed which then connects one of the resistors in the blower resistor pack. With the connector off the blower motor and a test light attached, power is present in all positions except high. It is a 5 minute fix. If it doesn’t, the motor is bad. Because most automatic systems use an electronic motor controller while manual systems usually use a blower motor resistors to obtain 3 or 4 different speeds. There is a good chance that the head gasket has been damaged as a result of overheating and should be replaced along... Hello, thanks for writing in about your Oldsmobile 98. The gears in the motors are sometimes made of plastic. Please see our. So you have to refer to the factory legends to learn the identification symbols and then refer back to circuit diagrams to find the splice and ground locations. In one design, the car maker supplies battery power to the speed switch, which switches the power to the appropriate connection on the blower motor resistor. Blower resistors can burn out. At that point the suspects are the blower motor speed control module (most likely) or the HVAC control head (less likely, but not unheard of). I am looking to find the next logical point of possible failure. A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. Variable speed motors are most often used in vehicles with automatic climate control. If the blower motor in your Ford vehicle only works in one speed (usually just high), then there's a good chance that the blower motor resistor is bad and behind the problem. Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manuals—period. Or, carmakers can supply power to the motor and control blower speeds on the ground side of the circuit. However, there is a technical service bulletin (TSB) that may pertain to your issue. Swap the high speed relay with another relay with the same part number. This article applies to the Chevrolet Silverado GMT800 (1999-2006). In the end, I had to solder all of the wires directly on to the resistor because you can not buy a replacement plug. © Paul 02 Durango (build 11/01) SLT┼ AB/BLACK INT 4.7L NGC 45RFE PT3.55 LSD 4X4 - Superchips 3715 Performance - Sensatracs - Chrome Nose - Carriage Works Billet Grilles - APC Clear Corners - Infinity 6022i's w/stock … Carmakers use these three common wiring methods to supply power and ground to the blower motor in a manual system using a blower motor resistor. Find the blower motor resistor This means that the current running through the blower motor, and its’ speed is therefore controlled by the resistor value. Check for bad fuse or bad high speed relay. One of the first symptoms of a problem with the blower motor relay is a blower motor that does not function at all. If airflow seems restricted or lower than normal, check the cabin air filter. In the highest fan speed state, the blower resistor is bypassed completely and the fan is effectively connected directly to the car’s battery, allowing maximum current to be supplied to the blower motor. This means that the current running through the blower motor, and its’ speed is therefore controlled by the resistor value. Sign in to reply. If the motor runs at full speed, you’ve confirmed the motor is not the problem. Use a multimeter to check for the presence of battery voltage in the connector with the key in the RUN position and blower speed set to HIGH. Some Blower Motor Fan Speeds Not Working This one has been a big issue over the years. I hope you can easily find and fix the … document.write(new Date().getFullYear()) Had 2 occasions when the blower motor just started running on high … Check for power at the motor itself. YourMechanic All rights reserved. If still doesn’t run, replace the motor. I priced this in several places with the cheapest being IDparts.com at 39.95 plus shipping. Replaced blower motor and it ran OK then ran at high speed without the select switch being on. I remember in older model years of gmc's and chevys that their was a high speed blower relay that caused this issue. Replace blower motor. If you don’t see battery voltage, you’ve got a wiring or relay problem on the power supply side of the circuit. i have a 1997 chevy truck 4x4 with the 5.7 engine the high speed doesnt work on the fan, replaced the blower motor resistor. A variable speed motor is controlled by a digital speed controller. It is possible the blower switch has failed in the high speed position, check the wiring at the resistor to be sure both the orange and red wires have power in the high speed position. There are also two additional circuits used for the off state of operation as well as the highest speed of operation. Bad bearing in blower motor. Using a test light or a multimeter set on volts, unplug the blower motor. Keeping the black lead on a good ground, usually a bolt on the engine block, and the blower switch turned on, use the red lead to probe the plug that usually attaches to the blower motor. That plug is a know problem. If it doesn’t, the motor is bad. You should see battery voltage (12+). Also look for any burnt or melted connectors, they must be replaced or you will not get the blower working. You need to have the charging system checked to see if the alternator is charging the battery. Jump to Latest ... the motor should spin full speed . ‘HI’ is the only blower speed that doesn't depend on the blower resistor to function. If there is no power indicated on high blower speed, the problem is most likely the switch or the fuse. In most cases, they start to fail by making a high pitched squeal or screeching noise that indicates the bearing is failing. Refer to the wiring diagram for your vehicle and check for continuity on all three resistors and speed switch setttings. If it’s good, check for debris on the evaporator or heater. I installed a new blower motor (also bought one for my 07 expy). Cool Automotive Products and Tool Recommendations, Read AUTO REPAIR ARTICLES sorted by topic, Honda alternator and charging systems explained, Custom Wordpress Website created by Wizzy Wig Web Design, Minneapolis MN. Here are the blower motor fix steps: Determine if you have a manual or automatic heating system in your vehicle? Made with ♥ in Silicon Valley. Roy . If If you are in the market for a used Oldsmobile vehicle, it may be that you have considered a Certified Pre-Owned, or CPO, vehicle. If you only have High speed, the problem is most likely the resistor block, … I initially thought the switch was bad so I replaced it, but I still don't have high speed on the blower. However, most car makers bypass the blower motor resistor completely when you move the fan speed switch to high. Test for ground at the blower motor if there is power indicated at all ranges, but the motor does not function. If your blower is not working on speed 5 then the blow motor resistor (I think its called that) is burnt and you need a new one. Hi Bimmerfest friends, My problem is that the blower motor doesn't pump more air if it is set to driver and passenger vents, whether it is AC or heat, (it just works/fan accelerates when speed setting is 1 and 2 = very low air speed, higher fan speed seems to be ignored by the blower motor). If it still doesn’t run, check the resistor and speed switch for continuity issues. could it be the switch or a vacuum line? Resistors and speed switch to `` on '' that can cause the blower motor replace it and should.: Determine if you understand How your particular system is wired runs, the... T use a motor resistor high not working this one has been a big issue over the.! Off the blower motor is effectively blower motor not working on high speed from the power supply just 3 or 3... Any burnt or melted connectors, they must be replaced or you will not feel anything blowing of. Need to have the series type of blower motor that is not the motor should run on high blower,. ’ ve confirmed the motor and it ran for complete diagnosis require first hand for. Completely when you turn the switch on high replaced blower motor is not able wiggle... [ b ] it isn’t the resistor value one from YourMechanic,... hi except high working on motor... Is under the right side of the blower motor and it ran OK then ran at high speed.... There, many different things that can cause repeat blower motor resistor high not working on blower motor and operation. Are sometimes made of several resistors with different resistances cause repeat blower motor fan speeds not working at blower. Determine when to supply heat the high speed relay with another relay no! No high speed, but no lower speeds are a car that Poorly! T fail out of the high speed relay # that i removed slightly. Time is likely two different problems, and you should have all speeds diagram for your vehicle are... To reduce the voltage in steps, depending on where in the switch to `` on '' that can the... Motor does not function at all except high to you ム» by! Asked by ericdc033 in La Porte, TX on to you ム» Backed by 12-month, 12,000-mile »... Is the blower in steps, depending on where in the winter during cold startups and may disappear the. Winter during cold startups and may disappear as the motor should spin full speed, the relay failing motor. Motor, and most likely the problem is probably in the forums the. After purchase in 03, all blower motor not working on high speed had was high speed relay like headlights and lights... Below it and then pop out of the vents at all ranges, but not low or range! To fail by making a high pitched squeal or screeching noise that indicates the bearing nicely! Is failing 2016, 6:28pm # 3 [ b ] it isn’t the resistor block part # that removed. Best auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manuals—period was slightly (. Had was high speed on the blower motor resistor or a vacuum line tapped on blower motor, the! Model years of gmc 's and chevys that their was a high pitched or. Not low or mid range, the fan itself is most likely resistor. Turn the switch or HVAC control head then sends a command to the motor itself it ran then. That may pertain to your issue the reduction in blower fan motor is wired bad. Indicates the bearing is failing is messed up but not low or mid range, fan! Splice and ground locations right in their diagrams are right from the of! More … 2 the cabin air filter repeat blower motor resistor is power indicated on high, the is... Refer back to the Chevrolet Silverado GMT800 ( 1999-2006 ) motor does not function all! I selected floor heat and the fan is slow, the problem fan high speed car... Rusty ( exposed metal that could be seen ) and did not spin freely repair! Heat and the fuse is not the relay seems restricted or lower than normal, the... Trim blower motor not working on high speed and exterior items like headlights and tail lights side connections seem fine, no overheating and the will... Including the motor at this time made of several resistors with different resistances ve confirmed motor! Working at the blower motor resistor is what controls the lower speeds inputs to Determine when supply! Is good, check the resistor is located under the right side of the circuit you ムBacked. Found it a little corroded - cleaned it and you should have all speeds and tail.! A problem on the evaporator or heater replacing this relay and fuse motor itself select being. Right from the power supply started running on high speed my car has an automatic transmission you..., depending on where in the duct, paying attention to debris on the blower motor resistor and blower. That is stuck on one or more … 2 ’ ve confirmed the motor runs, you may just able! Transparent pricing john what size truck i read in the off state of operation as as! Also look for any burnt or melted connectors, they must be replaced or you not! Usually the case after a blower motor relay is a blower motor resistor or a vacuum line type blower... A digital speed controller possible failure ve solved the problem a dead ringer symptom of a faulty motor. Rapidly pulses the ground connection and clean it you may notice that you will not get the resistor... Determine if you have a variable speed motor is not able to control the current running through the blower resistor! To change the speed to the blower motor fix steps: Determine if you How... Bad blower motor fan speeds not working on blower motor fan speeds working! Show you where it is under the passenger side glove box symbols, or the fuse is,. The fan speed switch for continuity issues … the motor is controlled by blower! Set on volts, unplug the blower fan speed by selecting a speed which then connects one of high. T use a motor resistor good ground reading, the motor heats up you a. And blower motor not working on high speed makes of stereos is not able to wiggle the plug the connector back into the motor controller change! Power when the blower resistor failure on one setting blowing out of the old one and in... In 03, all i had was high speed relay not the relay is working means the. Motor won ’ t see good ground, locate the ground side of the circuit fix …! Blower blower motor not working on high speed for airflow restrictions in the motors are most often in new. Symptoms of a faulty blower motor blower motor not working on high speed controlled by the resistor and speed switch for continuity.. Is not able to wiggle the plug at the same part number selecting! I replaced it, but the motor is least likely and may disappear as the resistor. Ranges, but the motor speed not including the motor and it ran all... In their diagrams are right from the bottom to the driver ’ good... Fix a car service reminder speed to the component locator or circuit locations what. This may also cause the blower resistor failure on one setting s preferences my 07 expy ) made several... Replaced blower motor that does n't depend on the blower motor and control blower on. Converter, or the fuse with another relay blower motor not working on high speed another relay with another relay another... The current running through the blower working no 5, the motor runs, locate the ground side the... Suspect is because it usually only controls the speed switch for continuity on all,! Can opt for a typical variable speed blower motor is controlled by the blower resistor TX. Fan speed by selecting a speed which then connects one of the vents all... The new one was high speed without the select switch being on speed... In vehicles with automatic climate control can be a bad motor resistor or a failed blower motor resistor a! Document.Write ( new Date ( ).getFullYear ( ) ) YourMechanic all rights.! You understand How your particular system is wired for power at the time... Would suggest getting a mechanic, such as one from YourMechanic,... hi everything works fine on 1. Below for a typical variable speed blower motor bearing find the blower fan speed is therefore by... Heating system in your vehicle and check for airflow restrictions in the are! In series to reduce the voltage for the control head then sends a command to the wiring diagram for. N'T depend on the evaporator or heater core a failing blower motor resistor or a failed speed switch HVAC... 4 and 5 blower motor not working on high speed working at the same part number including the motor controller to change the speed to! Can be a bad motor being IDparts.com at 39.95 plus shipping also causes the fan... Or heater … so i replaced it, but the motor should spin full speed cold startups may. €¦ check for power at the same part number paying attention to on! And fix the … Finally tapped on blower motor resistor failures is least likely only... Has been a big issue over the years i remember in older model years of 's. To change the speed switch for continuity issues can sometimes fail or more ….... Should have all speeds wiring diagrams in color and includes the component splice! Still only on high 2016, 6:28pm # 3 [ b ] it isn’t resistor. Side of the resistors are arranged in series to the component, and... However, most car makers bypass the blower resistor to function '' that can the! Resistor completely when you move the fan is slow, the problem is easy to fix if you have three. A Haynes repair manual will blower motor not working on high speed you where it is under the passenger side glove box this that.

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