Question about 2002 Chevrolet Prizm

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Fan doesnt kick off and on only when a/c is turned on

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The fan is controlled by the ecu, the temperature switch, and the ac relay. If the fan comes on when you turn on the ac, the problem is either in the temperature sensor, usually located on the front of engine near the thermostat housing. You can unplug the switch and use a little jumper wire to bypass the switch. If the fan starts, replace the temperature sensing unit. If not, the ECU is either failing to ground the fan ie. the wire from the fan to the ECU is defective, or the ECU itself is defective. All of this said, you are probably better off to take it to a shop and have them read the codes off of the ECU, which should tell you what the problem is. Most auto parts places like Autozone or Checker will check these codes for you for free.

Posted on Jul 28, 2010


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