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97 Pontiac grand am overheats as soon as it gets to running temp

97 Pontiac Grand Am GT (quad 4 2.4L)We have changed the head gasket as well as several other gaskets, installed a new thermostat, new water pump, new timing chain. We then flushed the whole system out. Problem continues, as soon as the car get to running temperature the coolant comes out the resivoir. Do not know what to check next

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  • reddebjones Jul 16, 2009

    No. my son cleaned it up and with the help of some friends (Mechanics) they made sure it was not warped. Even they are baffled. While idling it is fine. Once it reaches running temperature the coolant starts to rise out of the resivoir.

  • Richard Scordino May 11, 2010

    when you had the head off, did you have it dye tested for cracks and also checked for warpage?


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If electric fans are coming on, and you have filled the system with the heater turned on high to purge it of air, even though you flushed it, I'd have the radiator flow tested (even when flushing, coolant tends to go around internal blockages, limiting its ability to work correctly) otherwise you need to begin testing from square one like you had never seen it before (don;'t assume anything you did is working) Pressure testing of coolant system, hydrocarbon test at fill opening and engine compression tests are important as well as what I mentioned above.

Posted on Jul 16, 2009

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Ok, a couple of tries. 1, make sure the electric fan runs. 2, when engine is running at normal temperature, feel across the whole radiator, if you feel cool or cold spots, clogged radiator and replace it. 3, if it overheats quickly, possible headgasket failure, have a shop do a block test to confirm. Hope it is not #3

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