Question about 1999 Pontiac Firebird

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Overheating I have replaced engine coolant sensor and relay and the engine electric fan does not come on. I connected the fan direct and it turns on. What else can I check? I have a '93 formula firebird (LT1) Both my fans check out. Electrically everything seems sound. I just changed the thermostat and still does not work. The engine block however is hot and the return hose to the radiator is cold, so my thinking is the cooling pump has failed. My only worry/question is what turns on the primary fan? The thermocouple on the radiator when hot sends a signal to turn it on? Does the fan run all the time regardless? The secondary fan comes on fine when the a/c is turned on and has about a one minute delay when the a/c fan is shut off. Any suggestions appreciated.

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  • Rick O'Brien May 29, 2009

    Hi polarcycle, thanks for the input, but my style water pump is shaft driven, no belt. It's a 1993 formula firebird LT1 8cyl.

    Thanks.

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Thermostat is not opening, or is installed backwards is why the hose stays cold. Make sure the nugget is facing the engine block. If this is correct, make sure the belt is installed correctly and is rotating the water pump in the right direction. The fans are turned on by the PCM. You will need to get a diagnostic chart and follow it to find out what is going wrong.

Posted on May 28, 2009

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