Old 06-14-05, 10:06 AM
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Question overheating

I have a 92 chevy cavalier 4 cyl. 2.2 the fan doesn't come on when it should,only when a/c is turned on or when i unplug cooling temp. switch and it is idling pretty rough.Not sure if computer is getting a false reading or sending false info. or the computer needs to be replaced or junk the car.Need help please,thanx
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Old 06-14-05, 09:56 PM
Join Date: Dec 2001
Posts: 2,538
suggest taking to a shop and having vehicle scanned to determine if coolant temp sensor is reading the correct temperature and if ecm is turning on the fan relay at the appropiate temperature usually around 230 degrees.
you could try a new sensor as it sounds like it may be the problem but it is a guess at best you should see a shop and pay for diagnossis before spending to much in parts by trying to repair an overheating problem wich could not even be a fan related problem as some mechanical problems could cause overheating before the ecm would ever see a warm enough temperature to turn on the fan relay.

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