Question about 1991 Buick Century
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,
Posted on Oct 24, 2010
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Posted on Jan 02, 2017
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