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Re: grand prix overheating
It also sounds to me like you have blown out a headgasket from the combustion chamber into the water jacket.
This will boil the coolant internally (~800 psi peak cylinder pressure vs. 50 psi maximum pressure in the water jacket).
Also keep in mind a 3100 has iron block and aluminum heads which tend to "scrub" the head gasket into failure (over a long period of time) due to the different expansion rates of the metals.
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1988 Chevy R-30 1 ton DRW pickup (217k)
1991 Chevy S-10 4WD pickup (192k)
2000 Grand Prix GTP (218k)
2002 GMC Yukon (185k)
2009 G8 - GT (46k)
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