My car continue to overheat while running in idle or at low speeds

30

Asked by Sizzle3900 Jun 22, 2016 at 08:45 PM about the 2007 Pontiac Grand Prix GXP

Question type: Maintenance & Repair

I have a 2007 Pontiac Grand Prix gxp. My car
overheats while at idle and or low speeds.   On the
highway it is fine   I just had the coolant flushed but
it is still happening I also replaced the radiator cap

4 Answers

26,835

I agree with Tom. Look at the fan operation, coolant level and thermostat first. You will probably find the problem with one of those and they are simple to fix. Water pump and head gasket are significantly harder to repair and should not be attempted by a novice.

3 people found this helpful.
18,685

And who did your coolant replacement? Air trapped in the system after being drained and refilled is extremely common and will cause overheating. If it was a shop, they probably knew to bleed the air out and its likely OK, but if it was a do it yourselfer project you might want to check again for air in the system. There is a bleeder valve near the thermostat.

3 people found this helpful.
20

Honestly I've fixed the fan relay cause that's what I thought happened. Fan started working, coolant is topped off and the thermostat is fine water pump is fine for whatever reason it always gets hot when I'm at idle for more than 3-5 minutes

2 people found this helpful.
20

I have a 2007 Pontiac Grand Prix GT. I had the same exact problem if I drove in 2nd gear while I was on the highway and kept the RPMs up it would not overheat. Bottom line, after playing with it for quite some time, checking out the coolant level, changing the thermostat, backflushing the heater core, it ended up being the water pump. When I took the water pump off the fan blade on the back of the water pump was completely disintegrated. It looks like a Chinese Star.

2 people found this helpful.

Your Answer:

Grand Prix

Looking for a Used Grand Prix in your area?

CarGurus has 2 nationwide Grand Prix listings and the tools to find you a great deal.

Postal Code:

CarGurus Experts

  • #1
    munron
    Reputation
    8,220
  • #2
    James Sparrow
    Reputation
    7,520
  • #3
    Dorian Hendricks
    Reputation
    6,170
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Pontiac GTO
5 listings
Used Chevrolet Corvette
29 Great Deals out of 1,060 listings starting at $15,871
Used Pontiac G8
2 listings
Used Chevrolet Impala
9 Great Deals out of 107 listings starting at $4,632
Used Ford Mustang
65 Great Deals out of 1,259 listings starting at $4,995
Used Dodge Charger
38 Great Deals out of 645 listings starting at $4,888
Used Chevrolet Monte Carlo
7 listings starting at $3,000
Used Pontiac G6
21 listings
Used Chrysler 300
34 Great Deals out of 516 listings starting at $4,999
Used Cadillac CTS-V
1 listings starting at $38,388
Used Chevrolet Tahoe
24 Great Deals out of 911 listings starting at $11,900

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. Content will be removed if CarGurus becomes aware that it violates our policies.