cant figure out why car keeps overheating

Asked by Jan 06, 2016 at 04:53 PM about the 2002 Pontiac Grand Prix GT

Question type: Maintenance & Repair

changed water pump, both elbows, thermostat, upper intake manifold, did a pressure test and lost pressure right away but the car runs like there is no problem except it keeps overheating

3 Answers

10

Check for burn holes under the wire harness sitting on the Upper intake plenum, could be the coolant is leaking away through. I had the same problem 3 years ago on a 04 Buick Regal

1 of 1 people found this helpful.
20

If you are losing coolant and overheating, the most obvious thing would be the head gasket. Sealants may help depending upon how much fluid you are losing. I have used Barr's Copper Sealant for Intake manifolds on a high mileage Ford vehicle with the 5.4 Triton engine and it worked very well and eliminated fluid losses as well as making the engine run cooler and it doesn't use oil as it did before I put in the sealant. However, the engine never overheated, it only lost about 8 ounces of coolant per day, which was not normal.

1 of 1 people found this helpful.
4,465

If you are experiencing actual coolant loss then follow Indigo's advice. Barr's Sealant works very well and may save you spending more money on an old car. Also are you sure you got all the air out of the system. That's the most common problem with cooling systems that have been drained and refilled. Your car will not cool properly if there is air trapped in the system.

1 of 1 people found this helpful.

Your Answer

Grand Prix

Looking for a Used Grand Prix in your area?

CarGurus has 2,643 nationwide Grand Prix listings starting at $950.

ZIP:

Pontiac Grand Prix Experts

  • #1
    Js08016
    Reputation
    4,470
  • #2
    Tom Demyan
    Reputation
    3,110
  • #3
    munron
    Reputation
    2,510
View All

Related Models For Sale

Used Chevrolet Impala
578 Great Deals out of 34,503 listings starting at $1,100
Used Pontiac Bonneville
473 listings starting at $2,995
Used Chevrolet Monte Carlo
13 Great Deals out of 1,241 listings starting at $999
Used Ford Mustang
598 Great Deals out of 39,964 listings starting at $1,895
Used Pontiac Grand Am
1,054 listings starting at $1,500
Used Chevrolet Malibu
1,128 Great Deals out of 62,899 listings starting at $880
Used Chevrolet Camaro
443 Great Deals out of 31,893 listings starting at $1,450
Used Pontiac Firebird
7 Great Deals out of 762 listings starting at $3,800
Used Jeep Grand Cherokee
1,080 Great Deals out of 72,845 listings starting at $1,195

Used Cars For Sale

2007 Pontiac Grand Prix GT For Sale
4 Great Deals out of 58 listings starting at $1,995

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.