Question about 2002 Pontiac Grand Prix

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2002 Pontiac Grand Prix overheats

Hi. I've already changed the thermostat, water pump, and now the radiator. The fans work, but the engine still overheats.

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  • RichardRV Dec 19, 2008

    I also checked the oil and saw no evidence of water. My car runs smoothly, it just overheats, so I doubt it's worth tearing my engine apart to fix a head gasket. When I changed the radiator, I noticed that the coolant sensor and connector were okay. As I mentioned, the FANS DO WORK.

  • RichardRV Dec 20, 2008

    Yes this is true. The bubbles can't be seen with the radiator cap off, but I do see bubbles in the recovery tank. Also, I just noticed white smoke coming out the exhaust. It doesn't smell sweet like anti-freeze, but I still think it is. How long does it take to change both head gaskets on this car?

    Thank you, Richard R. Vasquez

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If the over heating occurs more when driving and not so much when idling, you could have a hose that is collapsing. I have also seen the water pump impeller coming loose on the shaft and that can cause this problem.
Ron

Posted on Dec 19, 2008

  • Ron Roske Dec 19, 2008

    A couple of additional thoughts are that you may have a bad pressure cap and you may want to consider doing a quick pressure test of the cap and system.
    Cheers!
    Ron


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Hi when does it overheat stopped or at high speeds this is the first things i need to know before i can help u

Posted on Dec 19, 2008

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Make sure the connector to the Coolant Sensor is not corroded. If so replace with a new connector  you may have damaged the head gasket.
also Check the timing. 

Posted on Dec 19, 2008

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The usual cause of this situation is a leaking cylinder head gasket, look for bubbles in the radiator with the cap off, or bubbles in the coolant recovery tank, these will be caused by combustion gases leaking into the cooling system from the blown hd gask..

Posted on Dec 19, 2008

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2 Answers

Why is my 2004 pontiac grand prix continuing to overheat? i put a new thermostat in.


More likely than not, you have done damaged the engine! Try this, with engine cold, remove radiator cap/coolant jug. Fill with water to proper level and leave cap off, then start engine. If the water/coolant goes immediately to gushing out that means you are getting compression from 1 or more of your engine cylinders into the cooling system from the heads or head gaskets being blown.

Also, depending on which engine your car has, (3.4L or 3.8L V-6) if 3.8L engine, they are know to get cracks in the plastic intake around the EGR valve area. Either way, as I'm sorry to say more likely than not, you'r engine has already suffered internal engine damage which can be very costly to fix.

If you know how, you can perform a compression test to determine which cylinders are damaged. But, if you are getting water/coolant in ANY of the cylinders, do not drive/run the engine as it will only get worse and cost more to fix. I hope this helps

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1 Answer

1991 pontiac grand prix le 3.1l overheating


I had an older vehicle that overheated. I flushed out the radiator twice, but it was so clogged up, I had to replace it, so check the radiator. If you inspect the radiator from the filler neck, you can see if there is crud build-up on the tubes. The problem could be the water pump. Typically when water pumps fail, they start to leak from the weep hole(s) on top and /or bottom. Is there any leak from the pump? If there is, that is indication that the pump need to be replaced. Hope this helps !

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what engine is in the car should be 3.8 liter you must have a thermostat in to keep it from over heating it will get hotter and hotter if you don't you diden't say if you were boiling over pressure was forcing out the water all makes a bid differnce in trouble shooting cooling system need more info on this one sorry

Jan 21, 2013 | 2002 Pontiac Grand Prix

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Looking for thermostat housing hose that leads from radiator to engine goes straight to water pump 2007 grand prix 3.8l


the hose that goes to the water pump is usually the bottom radiator hose, the radiator hose that goes to the thermostat housing is the top radiator hose......cheers.

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1999 grand prix gt overheating. Changed thermostat, water pump, upper radiator hose. Please help!


does the upper and lower hoses seem to be the same temp when car begins to overheat? ore the radiator cooling fans coming on before the car overheats? did you pressure test the cooling system and radiator cap? also may want to remove the lower hose and flush the radiator. is the check engine light on and does it run bad?

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2 Answers

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Have you shop perform a "leakdown test." You probably have a bad head gasket )or a leak in the gasket).

Aug 06, 2009 | 2002 Pontiac Grand Am

1 Answer

Heat fluctuation on temp gauge


change the sending unit to the fan, if that doesnt work check for power too the fan or even a bad fan

Mar 22, 2009 | 1995 Pontiac Grand Prix

1 Answer

1995 Pontiac Grand Prix GTP 3.4 L


There could be several reasons that may cause an engine to overheat. It sounds like you have covered the most important ones. Thermostat,radiator and water pump. Hopefully you do not have internal damage, cracked head, head gasket, or a cracked block. I would try flushing the heater core and pay close attention to what comes out. You know, is it clogged with stop leak or rust. Then while I was flushing that I would drain the entire system and put in some Prestone super radiator flush. You just add plain water with it and run your vehicle for about 10 minutes. You then empty your cooliant system and refill with antifreeze. The flush works pretty well and if there is an obstruction from a previous owner putting stop leak in the system it generally will clean it out.
BTW, are you sure the thermostat is in properly? Not upside down? I think I would start there before I went through all of the work of flushing the system. It actually sounds like from everything you've done already, that's possible. Hey it does happen once in awhile. Was this car overheating when you bought it? If so, maybe the previous owner put it in upside down, and when you changed it put it in the same way by accident.
Hope this helps.

Mar 10, 2009 | 1995 Pontiac Grand Prix

1 Answer

2002 pontiac grand prix over heating


Are your electric fans engaging or turning on?

Dec 26, 2008 | 2002 Pontiac Grand Prix

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