Question about 2002 Chevrolet Malibu

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The fan speed control switch works only on off and full speed

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You got a malfunctioning RESiSTOR BLOCK that controls the FAN speed! Go to ur nearest garage technician and check that!

Posted on Nov 10, 2010

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Engine cold. Start engine reading says engine hot ac off. Fans run all time.


Are the fans running on low or high ?
Circuit/System Description
The engine control module (ECM) commands the fans ON in either high speed or low speed, depending on cooling requirements. In low speed, both fans are turned ON at a reduced speed. High speed has both fans turned ON at full speed.
In low speed operation, the ECM applies ground to the coil side of the fan low relay. This energizes the coil and applies voltage directly to the left cooling fan through the switch side of the fan low relay, which is fed by the fan 1 fuse. The right fan is connected in series to the left fan through the de-energized fan control relay so that both operate at low speed.
In high speed operation, the ECM applies a ground to the coil side of the fan low relay, the fan control relay , and the fan high relay. On the fan high relay, the energized coil closes the switch side of the relay and applies voltage directly to the right cooling fan through the switch side of the relay, which is fed by the fan 2 fuse. At the same time, the ECM energizes fan control relay pulling the switch side over, providing a direct path to ground for the left cooling fan, which has voltage applied through the energized fan low relay. In high speed mode, the fans are operated as a parallel circuit with full voltage applied to each.
You should have it hooked up to a scan tool that can read engine sensor data parameters . Check for DTC'S - diagnostic trouble codes etc...
Circuit/System Verification
  1. If DTCs P0480 or P0481 are set, perform those diagnostics first.
  2. Ignition ON, verify with a scan tool that the control module is not commanding fan activation.
  3. Ignition ON, observe that the fans are not activated.
Your best bet is to take it to a ASE certified repair shop !

Jan 10, 2016 | 2009 Chevrolet Silverado 1500

1 Answer

What will keep heater fan from working( both fuses check good)?


The speeds are controlled by a resistor pack. Changing the resistor pack may restore full functionality. Volvo heater fans are notorious for squealing. Usually they are run at a speed that doesn't squeal. If it squeals at one speed, sometimes a different speed won't squeal. The resistors seem to eventually fail. They are fairly cheap to replace.

Feb 18, 2015 | 1994 Volvo 940

3 Answers

Internal fan only works on full blast


The switch is bad, replace the switch

Sep 15, 2011 | 2003 Hyundai Santa Fe

2 Answers

The blower on my a/c quits working, then starts again, then quits...and so on?? is my blower going out or something unplugged?


if it does this on any fan speed it is most likely a bad blower motor, if it inly while on a certin speed such as full high or full low it could be the fan speed resistor located right near the fan motor, screwed into the fan housing

Jul 31, 2011 | 2001 Pontiac Aztek

1 Answer

Heater & cooling fan only works on high.Power locks don't work.


there is a resistor for the heating and cooling fan speed. this controls the amount of voltage to your fan, which controls the speed. usually when the fan only works on high it will bypass the resistor and use the full 12 volts for the high setting. your power locks might be part of this circuit. i would check the resistor first then check the locks. usually the resistor is behind the high low switch

Mar 26, 2010 | 2000 Pontiac Montana

1 Answer

Intermittent operation of interior fan - isuzu kb/trooper


fan speed resistor block blown if fan works only on full speed (because power goes directly to fan on full speed, not through resistor)
if fan doesnt work on full speed check for power at fan on full speed with test light if power there fan faulty
no power check switch bank assembly

Aug 06, 2009 | 1999 Isuzu Trooper

1 Answer

Fan on the ac stopped working. Were is the resistor located.


I can't tell you where is the resistor but usually at maximum speed the switch bypass the resistor pack since there is no need of resistor at full speed, so if the fan stop completely, there is a good chance the fan is blown if it is not working at full speed.

Take a voltmeter and test for voltage at the fan connector with the speed fan switch on, you will be able to test all speed and if you do have voltages the fan is just dead.

Jun 01, 2009 | 2004 Jeep Grand Cherokee

2 Answers

Where is a fan control module on a 96 vw jetta trek


switch the ignition on. disconnect the fan switch connector on the radiator. the connector plug should have three pins (if two then its easier). you can follow a diagram, but you can connect the thin wire's pin with one of the thick ones (dont worry, the wrong one wont short anything). the fan should go on at low speed. then connect the thick wire that worked to the other thick wire. the fan should go on at full speed. please ensure the ignition is on to test the full speed one as it doesnt operate with the ignition off. if neither works then check the fan control module. its under your water bottle. remove the water bottle then two screws will remove that unit. btw. they never give in, but maybe this is a first.

Dec 06, 2008 | 1996 Volkswagen Jetta

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