Question about 2000 Pontiac Sunfire

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Blower motor does not work on first 2 lo speeds. Is there a diode for the switch or some other electrical problem.

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Hi,
You need to change the blower resistor located behind the blower
motor under the glove compartment

Posted on Jan 01, 2011

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1 Answer

Blower does not work and when it does it only works on high


Blower motor runs on three speeds lo med hi, the intsrument could be bad which switch the speeds.

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Blower motor will not shut off


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Jan 19, 2012 | 2005 Chevrolet Impala

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01- Dodge Caravan AC Heater Control it only works on high none of the speeds work when I rotate the switch from low to high. Is this a swith problem or a motor problem?


Most likely neither. The most common cause is that an electrical device called the blower motor resister block, has failed. This device provides all the slower speeds. It is generally mounted in the HVAC [Heating, Ventilation & Air Conditioning] box, very close to the blower motor. FYI, we mechanics call the fan motor inside the cabin the blower motor. The electric fan motor behind the radiator is called the cooling fan motor.
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Aug 22, 2011 | 2001 Dodge Grand Caravan

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Heater only works on low setting


First, check all your fuses- if you find one that is blown, replace it with one that is the same rating- if it blows right away, there is a wiring problem that needs troubleshooting.

If all your fuses are OK.....

Find where the blower motor is- on most vehicles it is in the right knee area of the passenger side up front... sometimes it is on the passenger side under the hood. If you cannot find it, set the blower speed to low, turn on your key, but do not start the car (don't do this for more than a few minutes, because it can drain your battery). Follow the motor sound....

If the motor has only two wires going to it, the problem is probably with either the blower speed switch or the blower speed control relay. Sometimes, a 2 wire blower CAN wear out in a way that it will only run on low, but you can eliminate that possibility....

With a 2 wire blower, you can check the motor by running a set of jumper wires from a battery to the blower and see if it comes on full speed. First, connect a voltmeter across the connector so you know which side gets + and which gets -. If you are not comfortable with doing this yourself, by all means get a friend with experience or a mechanic to show you how.

If the motor has a bunch of wires going to it, the problem is probably the blower motor itself. These can be very expensive, and your best bet is to shop around online for one.

Jan 30, 2011 | 1990 Chevrolet K1500

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Ok, my blower was not working at all. It used to work on the 2 and 3 setting. I replaced the resistor nothing. Took out blower and hooked it up to 12 volts it came on. So I went and bought a new control...


the blower motor is going. It's drawing too much current and taking out the resistor pack. It has a thermal limiter that melts when the resister gets too hot. Repalce motor and resistor.

Dec 10, 2010 | Ford Focus Cars & Trucks

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I have 2002 infinity I35 and the blower motor stop working ,I took out the blower motor to make sure was good. YES the blower motor still working .the only think I really don't know how to check is Blower...


WELL YOU HAVE TO USE A VOLT METER CONNECT ONE VOLT METER WIRES TO GOOD GROUND AND THE OTHER VOLT METER WIRES GOES TO EACH SWITCH SPEED.IF VOLT METER GET VOLTAGE A 1 OR 2 CONTROL SPEED RESISTOR BAD.IF RESISTOR BAD YOU WILL GET 1 OR 2 BLOWER MOTOR SPEEDS.IF BLOWER MOTOR WORKING.CHECK THE AC AND HEATER CONTROL SWITCH FUSE OR CHECK BLOWER MOTOR FUSE AND RELAY.IF ALL GOOD SO FAR CONTROL SWITCH ITSELF COULD BE FAULTY.

Nov 05, 2010 | Infiniti I35 Cars & Trucks

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The fan switch only works on level 5 out of 5... is this the selector switch?


You probably have a faulty blower motor resistor, this electronic part controls blower motor fan speed. This part is located near the blower motor, unhook the electrical connection and you will see 2 screws holding the part in place. This part looks like some type of circuit board, Good luck, Gary

Jul 27, 2010 | 2003 Chevrolet Impala

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97-Buick LeSabre Psycho-blower


sounds like a bad ground. with the blower on, measure the voltage between ground on the battery and ground on the blower. it should be less than 0.1v. if more, repair the ground. if ok, it may be corrosion at the fusebox or the HVAC module its self

May 28, 2010 | 1997 Buick LeSabre

1 Answer

Heater blower stopped working, it was intermittant for a while now does not work at all in any mode.


1. Check your fuse and/or relay for the blower motor. Unplug each one, inspect and replug it back in and recheck operation of the Blower Motor.
If that does does not fix the problem:
2. Locate the Blower Motor Resistor. It should be adjacent to Motor, and has 3-4 wires going into it.
The system works: Switches to Resistor to Motor.
Unplug the Resistor and check for voltage there. If there is voltage: Then the switches are good. If no voltage: the switches need to be checked.
3. Replug the resistor back in and disconnect the electrical connection/power going to the blower motor itself. Check for voltage coming from the resistor. Use the switches to change speeds and recheck each time for voltage. Go through the entire range of speeds on the switch. The voltage should fluctuate, increasing with each higher switch speed selected. If there is no voltage then the resistor is bad and needs to be replaced. If there is voltage and fluctuation with each speed, then the Blower Motor itself is bad and needs to be replaced.
4. Another (very different) way to check the Blower Motor is to take a verk long piece of heavy gauge insulated wire and connect one end of the wire to the positive side of the battery. Connect the other end or the wire to the Blower Motor. If the Blower Motor comes on, then it is not the Motor, but either a switch or resistor problem.
Let me know if this helped, or if you have additional questions, problems or information. Feel free to contact me at FixYa.com!

Jan 28, 2010 | 1996 Ford Explorer

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