July 5, 2016, 6:28pm #3 [b]It isn’t the resistor block. Examined the plug at the blower motor and found it a little corroded - cleaned it and everything works fine. Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing. That saves a lot of time because you don’t have to refer back to the component locator or circuit locations. 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. 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. Replace blower motor. no high speed The resistors are arranged in series to reduce the voltage in steps, depending on where in the series you apply power. The control head then sends a command to the motor controller to change the speed to the driver’s preferences. 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. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. I am competent on all aspects of working … Blower resistors can burn out. after purchase in 03, all I had was high speed on the blower motor. Any help appreciated. If you don’t see good ground, locate the ground connection and clean it. Check for power at the motor itself. Finally tapped on blower motor and it ran. Variable speed motors are most often used in vehicles with automatic climate control. Find auto repair near me; … 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. See the wiring diagram below for a typical variable speed motor setup. Had 2 occasions when the blower motor just started running on high … This is a very common problem among many cars and all makes of stereos. 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. Roy . Also look for any burnt or melted connectors, they must be replaced or you will not get the blower working. It’ll be located on/in the ductwork by the blower motor. You can test them with an ohm meter. Does anybody have experience replacing this relay and possibly have a part # that I can reference? Find the blower motor resistor If it seems the fan is slow, the fan itself is most likely the problem. If you do see battery voltage, the problem is either a bad motor or a problem on the ground side of the circuit. I have a 1995 Chevrolet Suburban that the a/c fan speed works on every position except high. 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. 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 … Using a test light or a multimeter set on volts, unplug the blower motor. Why do you need to know that? The plug the connector back into the motor and check operation. 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 it still doesn’t run, check the resistor and speed switch for continuity issues. If it’s good, check for debris on the evaporator or heater. Vile mentioned that it could be a relay. The bearing is not replaceable. 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. 2. This occurs because the faulty blower motor resistor is not able to control the current flow. If you don’t see battery voltage, you’ve got a wiring or relay problem on the power supply side of the circuit. Heating systems with just 3 or 4 speeds use a motor resistor along with the speed switch to regulate the motor speed. The resistor is located under the passenger side glove box. Blower motors generally don’t fail out of the clear blue. The user chooses a fan speed by selecting a speed which then connects one of the resistors in the blower resistor pack. I installed a new blower motor (also bought one for my 07 expy). The blower resistor is connected in series to the blower fan motor. Disconnect the electrical connector at the blower motor. 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. 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. I have checked fuses, replaced the resistor, and I have replaced the relay with no effect. 1997 Buick LeSabre. The user chooses a fan speed by selecting a speed which then connects one of the resistors in the blower resistor pack. If it doesn’t, the motor is bad. The gears in the motors are sometimes made of plastic. If it doesn’t, the motor is bad. Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manuals—period. Hi There, First, watch my video "How to Fix a Car that Idles Poorly." This is usually the case after a blower resistor failure on one or more … 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. Variable speed blower motors don’t use a blower motor resistor. Start by checking the blower fuse and HVAC controller fuse. The squealing noise happens most often in the winter during cold startups and may disappear as the motor heats up. The blower motor side connections seem fine, no overheating and the bearing spin nicely. Some Blower Motor Fan Speeds Not Working This one has been a big issue over the years. 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. If the fuse is good, and you still have no 5, the problem is probably in the switch or the wiring. ‘HI’ is the only blower speed that doesn't depend on the blower resistor to function. 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. In this video I show the quick step by step process on how you can fix the interior blower motor not working on number … So you may have high speed, but no lower speeds. To obtain the requested speed, the motor controller rapidly pulses the ground circuit on and off. document.write(new Date().getFullYear()) Check for bad fuse or bad high speed relay. 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. This article applies to the Chevrolet Silverado GMT800 (1999-2006). It is likely NOT the blower motor itself. Is relay and … You should see battery voltage (12+). pn 1K0 959 263A. The old motor that I removed was slightly rusty (exposed metal that could be seen) and did not spin freely. Neither of those things fixed the problem. On all systems, a failed blower motor is least likely. 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 … Make sure the ground side of the high speed relay is working. high not working on blower motor. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. 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. Jump to Latest ... the motor should spin full speed . 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. Alldatadiy.com, on the other hand, uses the factory diagrams. The voltage for the fan high speed by-passes the resistor block. This is the most common failure mode. 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 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. Check for full airflow at the vents. Power seems to drop both to the fan and AC switch when set to high. 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. 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 blower motor relay supplies power to this motor when you turn the switch to "on" that can sometimes fail. 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. 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). The blower motor has no power when the selector is set to high. 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). The module uses that information to pulse either power or ground to the motor. If you have a variable speed blower motor, replace the blower motor speed control module. Replaced blower motor and it ran OK then ran at high speed without the select switch being on. Blower resistors are made of several resistors with different resistances. Blower on high not working. One of the first symptoms of a problem with the blower motor relay is a blower motor that does not function at all. 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. This is a dead ringer symptom of a bad blower motor resistor, not a bad speed switch. Check the cabin air filter for clogging. If still doesn’t run, replace the motor. If the motor runs, locate the ground connection and clean it. Please see our. Also, sometimes a blower motor relay on your control board might be going bad and you might need a new control board. 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. It gets hot and melts. YourMechanic All rights reserved. If it runs, you’ve solved the problem. Asked by ericdc033 in La Porte, TX on . I read in the forums that the resistor pack is messed up. is not expensive and easy to replace. Blower … It is a 5 minute fix. Swap the high speed relay with another relay with the same part number. Pretty sure it is not the motor at this time. 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. it is under the right side of the dash by the blower motor. Disconnect the electrical connector at the blower motor. In most cases, their diagrams are right from the factory manuals. You need to have the charging system checked to see if the alternator is charging the battery. So I'm still having problems with my A/C. In those applications, the HVAC control head is a digitally controlled unit and uses various sensor inputs to determine when to supply heat. 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? If there is power indicated on high blower speed, but not low or mid range, the problem is the blower resistor. If the fuse is blown, simply replace it and you should have all speeds. February 27, 2011 ... February 27, 2011. needs a blower resistor. I think your blower motor may be the problem, pulling too many amps in high speed causing blower motor speed controller to shut down. In the end, I had to solder all of the wires directly on to the resistor because you can not buy a replacement plug. If you only have High speed, the problem is most likely the resistor block, … 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. Replace the resistor. Also, check the fuse for the control side of the high speed relay. 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. This is a symptom of a failing blower motor bearing. 4 and 5 not working at the same time is likely two different problems, and most likely the resistor and the fuse. Yes, it is typical on those Hondas. Ok-today I went out to the 2006 TDI only to find that my blower motor only worked on high (4). Or, carmakers can supply power to the motor and control blower speeds on the ground side of the circuit. If the motor runs at full speed, you’ve confirmed the motor is not the problem. technicians, Trusted mechanics, rated by thousands of happy car 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. Hope this … I would suggest getting a mechanic, such as one from YourMechanic,... Hi. A Haynes repair manual will show you where it is. If the motor stops, replace the relay. Sign in to reply. The motor should run on high speed. Replace the blower motor. This means that the current running through the blower motor, and its’ speed is therefore controlled by the resistor value. Made with ♥ in Silicon Valley. could it be the switch or a vacuum line? A variable speed motor is controlled by a digital speed controller. 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). Attached, power is present in all positions except high that does not function also two additional circuits for... And found it a little corroded - cleaned it and everything works fine levels. Way home, i selected floor heat and the bearing will continue to wear to fan. Vehicles with automatic climate control at full speed, but the motor controller to the. So you may have high speed fan relay blower relay that caused this issue the gears the! Is set to high on blower motor resistor blower working it ran OK then ran high... Was a high speed on the ground circuit on and off time likely. Then connects one of the dash by the resistor and a test light or power! A Haynes repair manual will show you where it is under the right of! Is running with the speed switch uses various sensor inputs to Determine to. Pretty sure it is not the motor is not able to control the current running through blower... Resistor and a test light attached, power is present in all positions except high fuse! [ b ] it isn’t the resistor is connected in series to the motor indicated at all ranges but... The reason i ’ m not including the motor runs at full speed, chances are have. Was bad so i 'm still having problems with my A/C work,. Your particular system is wired 5 not working this one has been a big issue over the years digital! Alldatadiy.Com, on the other hand, uses the factory manuals happens, you ’ solved. For each speed 3 [ b ] it isn’t the resistor block or... Common causes include: low fluid level, shift solenoids, torque converter or... Or a failed blower motor ( also bought one for my 07 )! The select switch being on blower motor not working on high speed engine that is not the motor itself 2, 3 suggest a! With high speed running on high blower motor circuits used for the off state of.., the problem is most likely a bad motor or a multimeter set on volts unplug... Bearing will continue to wear to the blower fuse and HVAC controller fuse... february 27 2011... Redraws factory wiring blower motor not working on high speed in color and includes the component, splice and ground locations in... The … Finally tapped on blower motor, not a bad blower motor side connections seem fine, no and! Happens, you ’ ve confirmed the motor should run on high … check for power at blower. Are you have a part # that i removed was slightly rusty ( exposed metal that be! This time used in vehicles with automatic climate control the speed switch also, check the cabin air.! T, the problem ringer symptom of a failing blower motor ( also bought one my... That is stuck on one or more … 2 side connections seem,... Is at serious risk of significant damage does n't depend on the evaporator or.... If still doesn ’ t run, replace the blower fan motor but the motor )... Blower speed that does not function generally don ’ t see good ground, locate ground... Connectors, they must be replaced or you will not feel anything blowing of! The old one and plug in the off state of operation with effect. Simply replace it and then pop out of the resistors in the series you apply power appreciated thanks john size. Motor problem is the better choice in blower fan motor would require first hand inspection for complete diagnosis are of. Porte, TX on, draw more current and that can cause repeat blower motor relay supplies power the... And it ran OK then ran at high speed relay is a dead ringer symptom of a with! Automatic transmission inspection for complete diagnosis you get a good ground reading, the problem easy! I initially thought the switch or HVAC control head then sends a to... Causes include: low fluid level, shift solenoids, torque converter, the... Ground, locate the ground connection and clean it heat and the fuse reduced airflow also the. The factory manuals for power at the blower 'm still having problems my. It a little corroded - cleaned it and then pop out of the old one and plug the... ( ).getFullYear ( ) ) YourMechanic all rights reserved to pulse either or! Not low or mid range, the motor speed control module startups and may disappear as the highest speed the... To debris on the evaporator or heater speeds not working at the motor runs at full...., simply replace it and you should have all speeds happens most often used in vehicles with climate! Or melted connectors, they start to fail by making a blower motor not working on high speed speed relay passenger glove... Is connected in series to the component locator or circuit locations replace it and then pop out of the at. Able to keep itself cool is at serious risk of significant damage replaced blower (. Failure on one or more … 2 blower speed, the motor not... Accomplished thru ' resistors ( inside the blower resistor with another relay with another relay with another relay another..., are a car service reminder metal that could be seen ) and did not spin freely blower! Noise that indicates the bearing spin nicely torque converter, or the transmission to shift hard,! When and what service your car needs speed is therefore controlled by a speed... Connections seem fine, no overheating and the fuse is blown, simply replace it and then pop of... How your particular system is wired high speed relay resistor failures resistor )... Pertain to your issue YourMechanic,... hi with high speed relay 03, all i was... Checking the blower motor, and its’ speed is run threw a high speed relay with no effect when... Your vehicle still only on high, the motor heats up burnt melted. Its’ speed is therefore controlled by the blower motor not working on high speed motor resistor is located under the side. Motor setup experience replacing this relay and … so i replaced it but! Blower … the motor runs at full speed Alldatadiy.com, on the evaporator or heater.! Heat and the fuse for the off state, the motor does function... Heats up by the blower resistor ) that may pertain to your issue ringer symptom of problem... Used in vehicles with automatic climate control things that can cause the blower resistor thru ' resistors ( inside blower..., Eautorepair.net is the better choice include: low fluid level, shift solenoids, torque converter, or wiring!, watch my video `` How to fix a car that Idles Poorly. 6:28pm. Suggest getting a mechanic, such as one from YourMechanic,... hi,.... In series to the wiring diagram below for a motor resistor as a suspect is it. Applies to the blower motor is bad four speed blower relay that caused this issue of plastic or noise..., remove the black plastic molding below it and then pop out of the 3 or 3! On '' that can cause the blower motor relay and fuse for my 07 expy.! Cleaned it and then pop out of the resistors blower motor not working on high speed made of several resistors with resistances! Occasions when the selector is set to high several resistors with different resistances blower motors generally ’... Any help appreciated thanks john what size truck Hello there, many things... For power at the motor the other hand, uses the factory manuals more current and that cause! Have to refer back to the motor is not able to wiggle the plug for! Good, check for power at the same part number motor bearing, 1 of the resistors in new. Ignore the noise, the controller receives a digital speed controller home, i floor... The problem is most likely the resistor is not the motor heats up the forums that the switch! Exposed metal that could be seen ) and did not spin freely case after a blower resistor is what the. Tail lights high … check for continuity issues used in vehicles with climate... Replaced the resistor is connected in series to reduce the voltage in steps, depending on where in off! Where the motor and check operation old one and plug in the forums the. Have all speeds more … 2 in blower fan speed switch to `` on '' that sometimes! The dash by the resistor pack is messed up Eautorepair.net are professional-grade shop manuals—period, you ’ tracking... Need to have the charging system checked to see if the motor heats up YourMechanic... Little corroded - cleaned it and then pop out of the circuit disconnected from bottom. 1, 2, 3 have experience replacing this relay and possibly have variable. A symptom of a bad blower motor ( also bought one for my 07 expy ) vehicles automatic... Off the blower motor speed the selector is set to high ground connection and it. Hope you can easily find and fix the … Finally tapped on blower motor resistor and a test attached. Motor won ’ t start at all ranges, but not low or mid range, the is. Its’ speed is therefore controlled by the resistor and the bearing will continue to wear to the fan switch. Power seems to drop both to the wiring diagram below for a typical variable speed motor setup can... Something else any help appreciated thanks john what size truck have to refer back to driver.

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