2004 Grand Prix Overheating


Asked by 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?

6 Answers


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.

1 people found this helpful.

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

1 people found this helpful.

Sounds like you have air in the cooling system. Is the heater working? If not air is my first suspect. HTH. -Jim


There's a lot of air coming out. On the 3rd round of bleeding.

1 people found this helpful.

When should I stop bleeding?

1 people found this helpful.

When you get a steady stream of coolant. If possible it's helpful to park the car with the front on an upward angle (nose pointing up) like halfway up the driveway. HTH. -Jim

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