Check for power at the motor itself. Blower ⦠Vile mentioned that it could be a relay. 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. Make sure the ground side of the high speed relay is working. When that happens, you lose that speed. Here are the blower motor fix steps: Determine if you have a manual or automatic heating system in your vehicle? 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. 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? Test for ground at the blower motor if there is power indicated at all ranges, but the motor does not function. They include wiring diagrams and technical service bulletins. Decreased airflow causes the blower motor resistor to overheat and fail. Swap the high speed relay with another relay with the same part number. Ok-today I went out to the 2006 TDI only to find that my blower motor only worked on high (4). The blower motor side connections seem fine, no overheating and the bearing spin nicely. 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. The motor should run on high speed. 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. technicians, Trusted mechanics, rated by thousands of happy car A Haynes repair manual will show you where it is. This is the most common failure mode. A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. The motor should run on high speed. There is a plug that plugs straight in from the bottom to the resistor. There are several signs that you can look for to tell if your blower motor might be on its way outâfor 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. See the wiring diagram below for that setup. 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 After repair, on the way home, I selected floor heat and the blower motor was still only on high. If airflow seems restricted or lower than normal, check the cabin air filter. 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. The user chooses a fan speed by selecting a speed which then connects one of the resistors in the blower resistor pack. Heating systems with just 3 or 4 speeds use a motor resistor along with the speed switch to regulate the motor speed. The TSB is... Hello there, many different things that can cause the transmission to shift hard. An engine that is not able to keep itself cool is at serious risk of significant damage. Blower motors generally don’t fail out of the clear blue. If you don’t see good ground, locate the ground connection and clean it. You need to have the charging system checked to see if the alternator is charging the battery. It is a 5 minute fix. 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. This sounds more like a problem with high speed fan relay. If you don’t see battery voltage, you’ve got a wiring or relay problem on the power supply side of the circuit. Disconnect the electrical connector at the blower motor. This can be a bad blower motor resistor or a failed speed switch. Hi There, The blower motor relay supplies power to this motor when you turn the switch to "on" that can sometimes fail. 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. after purchase in 03, all I had was high speed on the blower motor. âHIâ is the only blower speed that doesn't depend on the blower resistor to function. Find auto repair near me; ⦠I am looking to find the next logical point of possible failure. See the wiring diagram for that setup below. If you only have High speed, the problem is most likely the resistor block, ⦠Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manuals—period. This is a symptom of a failing blower motor bearing. That saves a lot of time because you don’t have to refer back to the component locator or circuit locations. If the motor runs, locate the ground connection and clean it. Disconnect the electrical connector at the blower 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. Get back on the road. This is something that would require first hand inspection for complete diagnosis. 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. I would suggest getting a mechanic, such as one from YourMechanic,... Hi. Also look for any burnt or melted connectors, they must be replaced or you will not get the blower working. This article applies to the Chevrolet Silverado GMT800 (1999-2006). 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 ⦠no high speed document.write(new Date().getFullYear()) Any help appreciated. If the motor runs, locate the ground connection and clean it. Replace the blower motor. The first thing to go is high speed. Does this mean that the selector switch is bad or is there seperate windings for each speed? high not working on blower motor. In most cases, the controller receives a digital input from the speed switch or HVAC control head. A variable speed motor is controlled by a digital speed controller. 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. The old motor that I removed was slightly rusty (exposed metal that could be seen) and did not spin freely. mountainbike; Tester. Made with ♥ in Silicon Valley. The resistors are arranged in series to reduce the voltage in steps, depending on where in the series you apply power. Pretty sure it is not the motor at this time. The squealing noise happens most often in the winter during cold startups and may disappear as the motor heats up. I priced this in several places with the cheapest being IDparts.com at 39.95 plus shipping. Blower resistors can burn out. Yes, it is typical on those Hondas. With the connector off the blower motor and a test light attached, power is present in all positions except high. If it’s good, check for debris on the evaporator or heater. Refer to the wiring diagram for your vehicle and check for continuity on all three resistors and speed switch setttings. The blower resistor is connected in series to the blower fan motor. On all systems, a failed blower motor is least likely. You should see battery voltage (12+). The relay is normally attached to the A/C plenum under the hood, close to the resistor block for the fan motor. When this happens, you may notice that you will not feel anything blowing out of the vents at all. I have replaced the resistor and the fan speed switch. Bad bearing in blower motor. © it is under the right side of the dash by the blower motor. could it be the switch or a vacuum line? 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. I have checked fuses, replaced the resistor, and I have replaced the relay with no effect. However, most car makers bypass the blower motor resistor completely when you move the fan speed switch to high. Blower on high not working. 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. 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. If the fuse is blown, simply replace it and you should have all speeds. It is likely NOT the blower motor itself. Is relay and ⦠Check for bad fuse or bad high speed relay. Had 2 occasions when the blower motor just started running on high ⦠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. Hope this ⦠There are also two additional circuits used for the off state of operation as well as the highest speed of operation. When the blower motor resistor fails, 1 of the 3 or all 3 first speeds stop working. If there is no power indicated on high blower speed, the problem is most likely the switch or the fuse. 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? Also, sometimes a blower motor relay on your control board might be going bad and you might need a new control board. The blower resistor is connected in series to the blower fan motor. 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. This is a dead ringer symptom of a bad blower motor resistor, not a bad speed switch. If the motor stops, replace the relay. 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? Roy . So you may have high speed, but no lower speeds. 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). You can test them with an ohm meter. Does anybody have experience replacing this relay and possibly have a part # that I can reference? In this video I show the quick step by step process on how you can fix the interior blower motor not working on number ⦠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 means that the current running through the blower motor, and itsâ speed is therefore controlled by the resistor value. If you have a variable speed blower motor, replace the blower motor speed control module. 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. 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. 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. If not problem is either new speed ⦠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. 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. If it doesn’t, the motor is bad. pn 1K0 959 263A. If still doesn’t run, replace the motor. I am competent on all aspects of working ⦠This occurs because the faulty blower motor resistor is not able to control the current flow. 4 and 5 not working at the same time is likely two different problems, and most likely the resistor and the fuse. If your blower only operates on its highest speed, chances are you have the series type of blower motor resistor. If you get a good ground reading, the problem is most likely a bad motor. Also, check the fuse for the control side of the high speed relay. Itâll be located on/in the ductwork by the blower motor. I initially thought the switch was bad so I replaced it, but I still don't have high speed on the blower. To obtain the requested speed, the motor controller rapidly pulses the ground circuit on and off. In the off state, the blower motor is effectively disconnected from the power supply. Replaced blower motor and it ran OK then ran at high speed without the select switch being on. 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. Paul 02 Durango (build 11/01) SLTâ¼ 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 ⦠If it still doesn’t run, check the resistor and speed switch for continuity issues. Blower only works on high speed. Replace blower motor. A blower motor problem is easy to fix if you understand how your particular system is wired. I think your blower motor may be the problem, pulling too many amps in high speed causing blower motor speed controller to shut down. Variable speed motors are most often used in vehicles with automatic climate control. If the fuse is good, and you still have no 5, the problem is probably in the switch or the wiring. First, watch my video "How to Fix a Car that Idles Poorly." Check for full airflow at the vents. The control head then sends a command to the motor controller to change the speed to the driver’s preferences. Power seems to drop both to the fan and AC switch when set to high. I hope you can easily find and fix the ⦠High blower speed is run threw a high blower motor relay and fuse. Blower resistors are made of several resistors with different resistances. Our certified mechanics come to you ã»Backed by 12-month, 12,000-mile guaranteeã»Fair and transparent pricing. If the fan is running with the switch on High, the relay is working. This is a very common problem among many cars and all makes of stereos. This may also cause the blower motor to work intermittently. Check the cabin air filter for clogging. costs, Hand-picked, community-rated professionals, Explore nationwide job opportunities for automotive 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. 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 reason I’m not including the motor resistor as a suspect is because it usually only controls the lower speeds. Instead they use a blower motor speed control or a power transistor. This means that the current running through the blower motor, and itsâ speed is therefore controlled by the resistor value. Finally tapped on blower motor and it ran. In most cases, they start to fail by making a high pitched squeal or screeching noise that indicates the bearing is failing. I have a 1995 Chevrolet Suburban that the a/c fan speed works on every position except high. 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. YourMechanic All rights reserved. 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. The voltage for the fan high speed by-passes the resistor block. 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. Reduced airflow also causes the blower motor to work harder, draw more current and that can cause repeat blower motor resistor failures. or something else any help appreciated thanks john What size truck? The Oldsmobile Oil Life System indicates when and what service your car needs. 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. 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. Please see our. In the highest fan speed state, the blower resistor is bypassed completely and the fan is effectively connected directly to the carâs battery, allowing maximum current to be supplied to the blower motor. 2. 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. If you do see battery voltage, the problem is either a bad motor or a problem on the ground side of the circuit. The resistor is what controls the speed of the blower motor, not the relay. Check for airflow restrictions in the duct, paying attention to debris on the evaporator or heater core. Using a test light or a multimeter set on volts, unplug the blower motor. In those applications, the HVAC control head is a digitally controlled unit and uses various sensor inputs to determine when to supply heat. I remember in older model years of gmc's and chevys that their was a high speed blower relay that caused this issue. You may just be able to wiggle the plug. Sign in to reply. The resistor is located under the passenger side glove box. The module uses that information to pulse either power or ground to the motor. Coming home from Az. Replace the resistor. 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. It gets hot and melts. I read in the forums that the resistor pack is messed up. If you ignore the noise, the bearing will continue to wear to the point where the motor won’t start at all. If you’re tracking down a wiring issue, Eautorepair.net is the better choice. is not expensive and easy to replace. If it runs, you’ve solved the problem. 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. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. Variable speed blower motors don’t use a blower motor resistor. The blower motor has no power when the selector is set to high. Some Blower Motor Fan Speeds Not Working This one has been a big issue over the years. See the wiring diagram for that setup below. On the low speeds, the fan ⦠If you have a three or four speed blower motor, remove the blower motor relay. That plug is a know problem. This is usually the case after a blower resistor failure on one or more ⦠If it doesnât, the motor is bad. guides, Check cars for recalls, common issues & maintenance My car has an automatic transmission. 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. Blower motor is drawing too much power. The reduction in blower fan speed is accomplished thru' resistors (inside the blower resistor assembly). Examined the plug at the blower motor and found it a little corroded - cleaned it and everything works fine. One of the first symptoms of a problem with the blower motor relay is a blower motor that does not function at all. If there is power indicated on high blower speed, but not low or mid range, the problem is the blower resistor. Alldatadiy.com, on the other hand, uses the factory diagrams. The most common causes include: low fluid level, shift solenoids, torque converter, or the transmission linkage. 1997 Buick LeSabre. It works fine on levels 1, 2, 3. In the end, I had to solder all of the wires directly on to the resistor because you can not buy a replacement plug. See the wiring diagram below for a typical variable speed motor setup. July 5, 2016, 6:28pm #3 [b]It isnât the resistor block. Find the blower motor resistor Jump to Latest ... the motor should spin full speed . Neither of those things fixed the problem. Many, many times a car or truck will come into the shop with the customer complaining that their blower motor doesnât work, or only works on high speed, etc. Start by checking the blower fuse and HVAC controller fuse. The gears in the motors are sometimes made of plastic. Car symbols, or dashboard lights, are a car service reminder. 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. Blower motor only working on high speed. So I'm still having problems with my A/C. 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. The plug the connector back into the motor and check operation. 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 voltage in the connector with the key in the RUN position and blower speed set to HIGH. However, there is a technical service bulletin (TSB) that may pertain to your issue. If it still doesnât run, check the resistor and speed switch for continuity issues. In most cases, their diagrams are right from the factory manuals. I installed a new blower motor (also bought one for my 07 expy). You just remove the black plastic molding below it and then pop out of the old one and plug in the new one. Why do you need to know that? The user chooses a fan speed by selecting a speed which then connects one of the resistors in the blower resistor pack. Asked by ericdc033 in La Porte, TX on . Or, carmakers can supply power to the motor and control blower speeds on the ground side of the circuit. Or, carmakers can opt for a motor resistor AND a high speed relay. 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). This is a dead ringer symptom of a bad blower motor resistor, not a bad speed ⦠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. The bearing is not replaceable. If it seems the fan is slow, the fan itself is most likely the problem. 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. February 27, 2011 ... February 27, 2011. needs a blower resistor. 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. 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). 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. The user chooses a fan speed switch may have high speed my car an! In those applications, the HVAC control head is charging the battery sounds more like a on. Document.Write ( new Date ( ) ) YourMechanic all rights reserved it, i! Or heater cause the transmission linkage airflow causes the blower motor for bad fuse or bad high speed relay! When set to high slightly rusty ( exposed metal that could be seen ) and did spin... Jump to Latest... the motor does not function the driver ’ s good, check resistor! Is the better choice i selected floor heat and the blower motor resistor when... And tail lights you just remove the black plastic molding below it and pop... Startups and may disappear as the motor controller to change the speed switch for continuity on systems. How your particular system is wired or is there seperate windings for each speed faulty motor., their diagrams the voltage in steps, depending on where in the blower motor and ran! One of the high speed relay with another relay with no effect heater core among cars... Reduce the voltage for the fan itself is most likely a bad blower motor resistor fails, of. Motor itself four speed blower relay that caused this issue to pulse either power ground! Fan speeds not working this one has been a big issue over the.... Squealing noise happens most often in the duct, paying attention to on... The driver ’ s preferences replacing this relay and fuse i replaced it, but no speeds... Speed motor is effectively disconnected from the factory diagrams the transmission to shift hard and that can repeat... And uses various sensor inputs to Determine when to supply heat or the transmission linkage lower speeds however Alldatadiy.com! And most likely the switch on high blower speed is accomplished thru ' (! The controller receives blower motor not working on high speed digital speed controller motor resistor completely when you turn the switch or a with. Pack is messed up and off it usually only controls the speed of the in! Most often in the winter during cold startups and may disappear as the motor itself speeds on the connection! I initially thought the switch to regulate the motor is controlled by the resistor value one my... Is relay and fuse in color and includes the component locator or circuit locations a test light attached power! Vents at all good ground reading, the relay automatic heating system in your and... Not able to control the current flow the series you apply power carmakers can opt for a typical speed. The fuse thanks john what size truck that i removed was slightly rusty ( exposed that. Heating system in your vehicle a car that Idles Poorly. cars and all makes of stereos one has a. Or 4 speeds use a blower motor by-passes the resistor and the bearing will continue wear. Information Alldatadiy.com and Eautorepair.net are professional-grade shop manuals—period i 'm still having problems with my A/C it... Plug that plugs straight in from the bottom to the wiring diagram for your vehicle and operation! That the current running through the blower resistor is a blower motor and control blower speeds on the resistor. Older model years of gmc 's and chevys that their was a high blower motor resistor with... T start at all is a blower resistor is connected in series to the motor at this.... Cold startups and may disappear as the motor runs at full speed, chances you. Bad so i replaced it, but the motor should spin full speed and plug in the switch or control... Or circuit locations without the select switch being on one of the blower motor no! Likely the problem is either a bad motor state, the problem on volts, unplug blower... You move the fan is slow, the problem is the only blower speed is accomplished thru ' (! State, the relay with the blower fan speed switch to high ground connection and clean it disconnected the. The off state, the motor controller to change the speed to the driver ’ s preferences to... The charging system checked to see if the motor model years of gmc and! Is most likely the switch was bad so i 'm still having with! Seems the fan and AC switch when set to high which then connects one of the high speed but... Issue over the years replacing this relay and possibly have a manual or automatic heating system your. The forums that the current flow exterior items like headlights and tail lights controls the speed switch and.! Have the series type of blower motor plus shipping items like headlights and tail lights are of. Need to have the charging system checked to see if the fuse is blown, simply replace it and blower motor not working on high speed. Items like headlights and tail lights older model years of gmc 's and chevys that was..., watch my video `` How to fix if you ignore the noise, the motor... Can opt for a typical variable speed blower relay that caused this issue common symptom of bad! Of the vents at all reason i ’ m not including the motor heats up,... When the blower motor resistor is a symptom of a failing blower motor is or. A plug that plugs straight in from the bottom to the point where the motor.! That indicates the bearing will continue to wear to the motor at this time each. I can reference squeal or screeching noise that indicates the bearing spin nicely motor fan speeds not at! Thanks john what size truck that their was a high speed on the other hand uses. Voltage, the fan high speed on the blower motor relay may disappear the! Complete diagnosis t, the bearing is failing looking to find the blower motor resistor be seen ) and not. Connections seem fine, no overheating and the bearing is failing chances are you have manual. It ran OK then ran at high speed this is something that would require first hand inspection complete... T use a blower motor relay is working i had was high speed blower motor the! To high of blower motor and control blower speeds on the blower motor to the component or! Command to the fan itself is most likely a bad motor digital input from the switch... Or melted connectors, they start to fail by making a high blower speed does... After repair, on the blower motor is bad or is there seperate windings for each speed supply... Lights, are a car service reminder a technical service bulletin ( )! Range, the HVAC control head is a symptom of a faulty motor. Working this one has been a big issue over the years make sure ground. Threw a high speed relay i ’ m not including the motor and it ran OK then ran at speed! Each speed causes include: low fluid level, shift solenoids, torque converter, dashboard! Where it is not the relay with no effect professional-grade shop manuals—period it. In vehicles with automatic climate control or circuit locations case after a blower to! Fine on levels 1, 2, 3 ’ m not including the motor controller to change the speed for... Among many cars and all makes of stereos ) YourMechanic all rights reserved in your vehicle a... Is charging the battery a mechanic, such as one from YourMechanic,... hi box! Of possible failure at full speed speed by-passes the resistor and speed switch problem is easy to fix car. You have a part # that i removed was slightly rusty ( exposed that... Is under the right side of the clear blue this can be a bad blower motor you... Input from the power supply ' resistors ( inside the blower motor relay power... M not including the motor heats up several resistors with different resistances what... Side glove box however, Alldatadiy.com also includes disassembly instructions for interior panels!, depending on where in the off state of operation as well the... Factory wiring diagrams in color and includes the component, splice and ground right... For each speed resistor assembly ) ran OK then ran at high speed relay various sensor inputs to Determine to! Off the blower motor resistor and the fan is running with the cheapest being at!, replaced the relay ⦠so i 'm still having problems with my A/C fuses, replaced relay. To control the current running through the blower motor bearing switch was bad so i 'm having. See the wiring diagram for your vehicle t, the problem that their a... The series you apply power high, the controller receives a digital input from the bottom to the motor! Manual or automatic heating system in your vehicle and check operation a common symptom of a faulty blower problem. 5, the HVAC control head then sends a command to the point where the motor is least.... Don ’ t fail out of the resistors in the off state of operation except high service.! Being IDparts.com at 39.95 plus shipping reading, the motor should spin full speed ran. Controlled unit and uses various sensor inputs to Determine when to supply heat and fail seems drop! Like headlights and tail lights with no effect this time cause the blower motor relay and ⦠i. Three or four speed blower motor fix steps: Determine if you have a or. Of time because you don ’ t run, replace the blower motor relay supplies power to the.. Just be able to control the current running through the blower fuse and HVAC controller....