My 04 grand prix supercharged is leaking coolant?

Asked by Jan 21, 2017 at 10:12 PM about the 2004 Pontiac Grand Prix GTP

Question type: Maintenance & Repair

I was told its a freeze plug? Its leaking from the
front under the headers like once you dump water
in it goes right back out any ideas please the car
runs and sounds great besides the over heat

3 Answers


Yep sounds like a freeze plug, only way to fix it is too replace it, and if one is bad the others might also be very weak. And yes it is not a very cheap or easy job to replace them.

1 of 1 people found this helpful.

You should also NOT be driving it like this, you're losing most of your coolant and engine overheating will soon turn this motor into a boat anchor.

1 of 1 people found this helpful.

Although the location sounds wrong, the plastic elbows that take coolant to the heater core are prone to breakage and will dump coolant faster than you can replace it. Before you rip into the engine check them as well as hoses etc. Sometimes coolant sprays out and appears to be originating in a different place than it really is. In any event, Ken is right. Other than starting it up for a few minutes to move it around you should not be driving it at all. Overheating it will wreck the engine in very short order.

2 of 2 people found this helpful.

Your Answer

Grand Prix

Looking for a Used Grand Prix in your area?

CarGurus has 1,896 nationwide Grand Prix listings starting at $3,000.


Pontiac Grand Prix Experts

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

Related Models For Sale

Used Chevrolet Impala
370 Great Deals out of 27,549 listings starting at $1,499
Used Pontiac Bonneville
342 listings starting at $2,000
Used Chevrolet Monte Carlo
953 listings starting at $3,786
Used Pontiac G6
24 Great Deals out of 2,903 listings starting at $699
Used Chevrolet Malibu
635 Great Deals out of 48,779 listings starting at $1,500
Used Pontiac Grand Am
756 listings
Used Pontiac GTO
3 Great Deals out of 374 listings starting at $3,950
Used Ford Mustang
294 Great Deals out of 38,680 listings starting at $1,995
Used Nissan Maxima
223 Great Deals out of 18,274 listings starting at $1,500
Used Chrysler 300
320 Great Deals out of 19,234 listings starting at $1,999
Used Honda Accord
565 Great Deals out of 92,879 listings starting at $1,495

Used Cars For Sale

2005 Pontiac Grand Prix GTP For Sale
28 listings starting at $3,000

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.