Question about 1991 Pontiac Grand Prix

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Car overheats. no coolant leak. fan doesn't seem to come on when hot

Low coolant light comes on. But I can't see a leak but still need to add coolant at end of day. The fan doesnt seem to come on when it is hot. Is this a fan clutch problem? Or is this maybe a water pump going bad? Or a thermostat and a combination of the three?

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  • AndreaCC1011 Dec 02, 2008

    I have the same problem. so what do i do?

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Could be an internal leak, which means it's either one of the head gaskets or an intake manifold gasket. Probably the latter one seeing as these cars are know to blow intake manifold gaskets. let me know what you find out! As for the fans I have no idea

Posted on Feb 10, 2009

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If the fan isn't coming on when hot, check the 'cooling fan control' (which signals the engine control computer that the fan should go on at a certain temp, and check the 'cooling fan switch' which should turn the fan on when told to by the computer. Also check your radiator cap, hopefully one or a combination of these will fix the car. Let me know how u make out.

Posted on Oct 24, 2008

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1 Answer

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1 Answer

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1 Answer

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