Question about 1983 Porsche 944

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Over heating then cooling to much

We replaced the thermostat and because the car was overheating the car is still overheating. but when the thermostat gets to 3/4 both fans turn on and it makes the thermostat shut off but the fans keep going also the heat blows cold

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Overheating can be caused by defective radiator, core plugged or fins have come seperated from the fluid tubes or one of the radiator hoses have collapsed esp the bottom one when the water pump is sucking hard, normally has a spring inside to prevent this.. also caused by a rotted out head gasket and coolant is not circulating fully to the rear cylinder so is only cooling front cylinders.. can also be a defective water pump or thermostat itself. The air conditioner load may be excessive if you're using that... defective radiator pressure cap, should be 14 lbs or so... pressure too low or none?

Posted on Jun 02, 2009

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Have you tried replacing your heater core? May be going out.

Posted on Dec 28, 2008

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