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 of 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 of 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 of 1 people found this helpful.

When should I stop bleeding?

1 of 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

Your Answer

Grand Prix

Looking for a Used Grand Prix in your area?

CarGurus has 2,659 nationwide Grand Prix listings starting at $1,750.


Pontiac Grand Prix Experts

  • #1
  • #2
    Tom Demyan
  • #3
View All

Related Models For Sale

Used Chevrolet Impala
580 Great Deals out of 34,490 listings starting at $900
Used Pontiac Bonneville
482 listings starting at $2,995
Used Chevrolet Monte Carlo
10 Great Deals out of 1,252 listings starting at $999
Used Ford Mustang
603 Great Deals out of 39,402 listings starting at $1,895
Used Pontiac G6
42 Great Deals out of 3,872 listings starting at $1,200
Used Pontiac GTO
6 Great Deals out of 453 listings starting at $4,995
Used Pontiac Grand Am
1,072 listings starting at $1,500
Used Chevrolet Malibu
1,080 Great Deals out of 62,433 listings starting at $880
Used Chrysler 300
324 Great Deals out of 19,491 listings starting at $900
Used Jeep Grand Cherokee
1,072 Great Deals out of 72,501 listings starting at $1,195

Used Cars For Sale

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.