Question about 2002 Pontiac Grand Prix
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Posted on Jan 02, 2017
If its the 3.1L it could be your intake manifold gasket , the material used for the gasket does not react well with GM's Dex-Cool antifreeze. The leak may not be apparent at first, but I would pressure test the cooling system. If you look at the front of the motor by the belts , try to peek down at the intake manifold and check for slight seapage to an obvious leak.
If its either of the Quad-4's they were notorious for heads warping or cracking.
Posted on Feb 03, 2009
Hi , if you lift up your passenger side floor carpet and check underneath if there any coolant. If it`s dry you know the leak is in the engine bay ,if it`s wet could be either inside or outside of the firewall. In the engine bay check the hose clamps on both side of the hose if you can tight them or if one a those spring clamps try to reposition them. If you have hose clamp right at the firewall then you can easily change the hoses otherwise you have to access it from under or worst case behind the dash. Hope that helps.
Posted on May 29, 2009
It's probably your water pump dripping down behind the harmonic balancer. Many GM water pumps have a hole in the top of them. When they start to go bad, they start to leak out of that hole. I guess it's GM's way of "letting you know" there is a problem. If your water pump would just seize, and no indication was there, so you knew, you could burn you engine up in 10 minutes of driving.
Posted on Sep 04, 2009
The evaporator drain is plugged with debris and filling up the heater case. Remove the 90 degree elbow and clear the drain hole at the case.(pencil or piece of wire) You will know that's it when it dumps out a half gallon on the floor. Be sure to reinstall the elbow to keep out rain/ road spray.
Posted on Feb 25, 2010
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