Question about 1998 Chevrolet Cavalier

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Heater/ AC blower motor does not work on the two lowest fan settings on dashboard control.

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  • Chevrolet Master
  • 373 Answers

I'm not that familiar with Cavys, but the usual cause for losing fan speeds is the blower resistor.
The resistor is usually located under the dash, passenger side, near the blower motor.
It should look like this:

Heater/ AC blower motor does - zeevert_50.jpg

Posted on Mar 27, 2011

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The fan speed switch for the heater/ac will not work on the two lowest speeds, only med to high. Went to a salvage yard and got a replacement one, it does the same thing. Apparently there is something...


You need to get the blower motor resistor replaced.This is your problem.It is located by the blower motor.There will be a connector from the blower to the resistor.The resistor controls the fan speeds when you turn the knob on the control head.The blower motor is on the passengers side under the dash.Hope this helps.Good luck.

Mar 05, 2011 | 2003 Buick Century

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The heater fan on my 1993 f-350 has become really loud. I only have hi speed which I understand may be a resistor issue but how do I remove the fan and motor assembly to inspect it?


A heater blower motor resistor is an electronic device with three or more progressive resistors that allow the heater blower motor to operate at slower speeds. The highest speed of the heater blower motor is not controlled by the resistor, so when the resistor fails, the fan will often work on the highest speed setting, but not the lower speeds.
To resistor is generally located under the dashboard and under the hood, near the blower motor . The resistor's electrical connector is disconnected, the resistor is removed and the new resistor is installed. On some vehicles it may be easily accessible, and on others it may take partial dashboard removal to replace the resistor.
Look under the hood, generally the wiring for the Blower resistor is attached to the wiring to the blower motor itself
It's inboard & below the motor, near the accumulator. You can see it standing beside the passenger fender. it's the off-white connector behind the L heater hose above the vacuum reservoir & the white WARNING sticker

Feb 12, 2011 | 1993 Ford F350

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The ac is on full at all times, even when you adjust the fan hight. someone sayed i need a a/c auto amplifier. but i can't find that part


Good Evening, If I am translating this properly your fan only works on the high setting? And the other settings do not change the speed? If this is correct respond back and I will help as much as possible.

Nov 06, 2010 | 2001 Nissan Pathfinder

1 Answer

I own a 2005 jeep liberty. the ac, heater fan only works on selector switch setting # 4. nay sugesstions on why fan does not work on settings 1, 2 or 3.


The lower speeds are accomplished by running the power supply through various resistors that drop the voltage which makes the blower turn at different speeds. The lowest setting uses all the resistors to drop the voltage as much as possible to turn the blower as slow as possible. High speed uses no resistors so the blower gets full power and turns as fast as possible.

Since speed 1 and speed 2 use the speed 3 resistor to drop there voltage and speed three is not working as well my guess is the speed three resistor is burnt out in the device referred to as the blower motor resistor or blower motor speed control module. This is located near the blower motor and is held in place with 2 screws. There will be several wires and possibly two connectors plugged into it.

These are really common failures in many vehicles. The parts are usually available at your local auto parts store and they are typically not that expensive.

Hope that helped.

Oct 07, 2010 | 2005 Jeep Liberty

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2002 Honda Odyssey fan only works at high speed. The A/C compress


Usually when the blower fan only operates on hi speed, its because of a failed blower motor resistor. You still have hi speed because on hi, the power going to the blower motor goes directly to it, as opposed to the lower speeds, when the power is routed through the resistor, thus lowering the voltage, which in turn lowers the speed of the fan. The resistor is usually located near the blower motor itself, under the hood back near the firewall.

Aug 15, 2009 | 2002 Honda Odyssey

3 Answers

Subject: 2004 isuzu rodeo...my ac/heater blower is not working


The resistors are in circuit only on the lower fan speed settings.
On the highest speed setting, power is switched directly to the fan motor.
Check fan power supply fuses,
Check power is available to the fan when high speed selected.
If all above OK, apply power directly to the motor to verify fan motor runs- if it doesn't the motor may need replacement/repair.

Jul 29, 2009 | 2004 Isuzu Rodeo

1 Answer

1994 Lincoln town car/ no fan control on ac and heat


I aasume you mean blower motor for heater/a/c system.

Does it work on hgih speed only? If yes, replace resister.

Is this manual a/c or electronic?

Here is circuit for manual. check these three fuses first. 1, 17 & 10 in fues panel behind dash or kick panel by driver's knee.

0ecd810.gif
If you have electronic, you may have a bad "blower motor speed controller". Get used at car-part.com. page with asterisk is lowest price. New at tascafordparts.com

Jun 16, 2009 | 1994 Lincoln Town Car

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Fan blower motor


The Canyon has an inherint problem with the Fan Power cable being loose. When I say loose...I'm saying that you need to adjust the wires and then take a zip strip to tighten it up.

Passenger side under the dask are 2 cable hook ups. the one on the farthest right (Only 2 wires going to the plug) is the fan power cable. Jiggle it while the fan is on position number3 so you can hear when it comes on!!!

Nov 18, 2008 | 2004 GMC Canyon

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