Question about 1991 Buick Century

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Electric fan does not work - 1991 Buick Century

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This can be due to a bad relay or coolant sensor that turns on the fan or a bad fan, a good test to do to see if the relay and the fan work is to start the engine and then turn on the ac, if the ac doesnt work then unplug the coolant temp sensor this will turn on the check engine light but it will reset when you restart engine, if the fan turns on then fan and relay are good and its the sensor, if the fan doesnt run then it may be the relay or fan, a quick test of the fan is to dissconnect plug to fan and run a power and ground wire to fan and if it runs then you have a bad relay,hope this helps,electric fan does not work - e0be4e7.gif

Posted on Oct 24, 2010

  • Anonymous May 23, 2011

    The above is all 100% good info on the fan relay. However, you may need to know that major car parts stores (chains) will sell you a 1-wire Temperature SWITCH if you ask for it, even though the 1987 and later all have a 2-wire Temperature SENSOR that goes to the ECM (computer). I was faked out because I saw the fan turned on when the ignition was off, so I thought there had to be a circuit that did not involve the computer, There is not. The fan relay is driven ONLY by the computer, as shown in the Haynes manual, both the text and 2.5L wiring diagram. I can't believe car parts stores will sell you stuff they should know can't be used.

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