Question about 2002 Pontiac Grand Prix

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Engine overheats on Pontiac 2002 GP

Recently had coolant changed by dealer and engine is overheating on steep inclines. Pontiac GP,2002,100,000 miles, V6

Larry M.

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  • Anonymous Apr 03, 2009

    I have the same issue. There is also a strong smell when I am going up an incline.

  • Anonymous Mar 25, 2014

    coolant leaking in to oil 2002 pontiac gran am gt 3.4or 3;8 v6 ramair



1 Answer

Check the catalytic converter. If it is clogged, it will reduce your your power and increase the temp of the car, especially on steep inclines.

Posted on Aug 31, 2008


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That depends on how often the engine is abused, how long it sits without running, the length of time between oil changes and driver habits. Normal mileage for that engine is greater than 100,000 miles before overhaul if it has never been overheated and serviced correctly as stated in the owners manual.

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Place car on a steep incline or raise front end up higher than the heater core. Now, add coolant to the radiator as needed, with engine warmed up. It sounds like the radiator is lower than the heater core causing an air lock and if that is the case this will allow the air bubbles to escape.

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Have the cooling system checked for hydrocarbons, you may be dealing with a head gasket regardless of the fact of that you are not losing any coolant.

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The cabin heater has not been working for a couple of weeks (it used to blow some hot air but now no hot air) and now the car overheats at idle. Can you suggest a solution or a part to check?

first thing, change the thermostat. this should fix the overheating problem. Your hot coolant goes from the engine to the radiator core, then back to the engine. If your thermostat is stuck shut, you will overheat. try this first, and let me know, If you still have problems, We will get it fixed. hope this helps

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2002 sunfire overheating

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Pontiac gp 02 overheating

thermostat should be replace on over heated engine, the spring loses tension, probaly not problem, most like head gasket if over heated severly, if you have a air pocket & wornt purge thats one sign,press test on cold engine let sit at start up run slightly rough may see & smell coolant at tail pipe, could also pull plugs may have one wet all crude checks, there is also chemical you put in coolant & use a a stripe for combustion I think napa or snap on sells, alsoyou could do tear down & inspection wish you luck not sure what engine or car you have grand am or grand prix my guess a GP with poss 3.4 more likely then 3800 engine

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1 Answer

1999 Cadillac Seville STS Overheating

Sounds more like an ignition control or coolant flow problem. Or, a/c fan not coming on with a/c.
Getting the water pump question out of the way, the pump either works or not. If it leaks it will cause an overheat due to coolant loss on flat ground or grades...doesn't matter. If the pump bearing or seal is bad it will still pump, it will just be loose and noisy. Coolant flow through the radiator is also essential...I don't think you have a problem there because generally this happens with less maintained higher mile cars.
A bad map sensor can cause your problem because it changes both ignition timing and fuel mixture, either of which can cause very high temps in combustion chambers especially when under a load. Mass air flow sensor can also do this but usually will cause idle problems. If fan is not on with a/c if the remainder of your cooling system may be enough to maintain decent temp control but cannot do this under a load. A/C turned off removes some load and therefore allow you to get up hills. Operating marginally, you can be pushing some coolant out of the system at times without even knowing it.
Now, about your engine: These engines are in my opinion a very poor design to begin with. Even with the best maintenance and low miles, they don't handle temperatures well. at this point, I'd be concerned that after repeated overheats and near overheats, your head gaskets may have started to fail, even though they were not the cause of the problem.Keep that in mind.
Have the items I mentioned tested. If you finally have the problem solved I suggest you change the thermostat as well...Overheating makes them unreliable.

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Need to know what is done in a 100,000 mile service

normal tune up
chasis lubricationtie
tie rod lubrication
trasmission service
if 4X4 transfer case fluid needs change
differential fluid needs change "both if 4X4"
brakes need service if they havent recently
coolant is probably bad too
how is the battery?
check serpentine belt

these are just a couple......"there could be a couple that dont need service but this is what i would do".

hope this helps XD

May 13, 2009 | 2002 Chevrolet S-10

1 Answer

58.5K miles - 2004 - car overheated on expy. Coolant Temp gauge went off the scale and motor died. Dealer analysis: valve broke & damaged sparkplug cyl & piston. overheated coolant damaged...


Whatever the reason for the engine siezing, it will be to your advantage to replace the radiator as debris may already be blocking a number of the lines.

As to the overheating, the most likely reason is a failed water pump (most likely), or a thermostat stuck closed (least likely), or a coolant leak (noticeable). Since engine would be replaced, the water pump and thermostat would also be replaced and the leak would be verified upon installation of the new engine.

Incidentally, I was made to understand that Hyundai warranties their drivetrain for 10 years or 100,000 miles. I believe the engine is a part of the overall drivetrain system.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Jul 29, 2008 | Hyundai Elantra Cars & Trucks

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