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2005 Grand Prix Comp G GTP... no heat coming from heater/ almost over heating.. HELP

Rileys05GTP

Rileys05GTP

New member
Hey I got a 2005 Comp G GTP with 70,500 miles on it, just recently the car started to get just under overheating on the gauge and the heater wont blow hot. Thought it may be a thermostat so changed that and it didn't help the temp gauge then just started moving and would still get just under overheating with no hot heat. So I took the car to my mechanic and he found that the water pump was bad so changed that. Still did not fix the issue. So then took the engine apart assuming maybe a bad head gasket or bad head. Had the heads sent into a auto shot and the heads are in perfect condition and didn't even need cleaned up. Really puzzled with what this problem could be were putting the engine back together tomorrow with new head gaskets.

If anyone has any ideas please let me know!! Thanks
 
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Wow, even took the heads off. Just an FYI these head gaskets are pretty stout, and don't tend to give out very often. Are you losing any coolant by chance when you check the radiator? Have you ever flushed the radiator? Dex tends to crud up when mixed with green antifreeze. Maybe the previous owner put green in with Dex? Heater core maybe clogged?
 
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