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Either you have a cracked head/engine block OR your head gasket is bad. This motor was notorious for bad head gaskets... Do a pressure test of the cooling system to check for symptoms. two possible reasons ,your timing is out of sync,or your cylinder head gasket is leaking,one other possible cause is a leaky hose . Or your radiator is clogged internally or externally and needs cleaning/flushing. You may also have air trapped in the system if you did not bleed it properly. Another possibility is that the cooling fan is not functioning properly. And one last possibility is the thermostat was installed upside down.

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โˆ™ 2006-06-17 16:11:11
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Q: Why would a 1995 Pontiac Grand Am 2.3 liter quad 4 still overheat after changing the thermostat and water pump?
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