2004 Grand Prix Overheating
30

Asked by iNeedCarAdvice Oct 17, 2016 at 12:14 AM about the 2004 Pontiac Grand Prix GT2

Question type: Maintenance & Repair

My car overheats after replacing the
radiator, thermostat, and PVC heater code
connections. What else could it be?

4 Answers
101,565

KenF answered 7 years ago

Can you confirm you have any kind of flow through the radiator, or that the water pump is cycling coolant? Open the radiator cap (with engine cold) and watch coolant in radiator get sucked down when thermostat opens once engine reaches operating temp. When that happens you should also see coolant flow out of internal radiator tubes. If not, you have a possible bad water pump.

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30

iNeedCarAdvice answered 7 years ago

Water pump was replaced before last winter. I'm bleeding the air from atop the thermostat housing right now.

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