Question about 1999 Pontiac Grand Am GT

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99 grand am gt....the engine and everything works fine, but dont know why overheats that i have to manipulate the valve so it release a pressure that acumulates so can flow normally with the coolant....i want to know possibilities of what could it be....

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  • Pontiac Master
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Try changing the thermostat first,and bleed the air out of the cooling system.

Posted on Jul 12, 2010

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I have a 1999 Pontiac Grand Am GT and it is overheating. We have changed the thermostat, water pump and tried flushing the heater core. It didn't work the car is still overheating and when the heat is...


if you have done all you said you have their is only two things left i know of that will cause them to overheat and the first thing is if its the 4 cyl 2.4 litre it is probably the head gasket blown really common on the 2.4 engine. If it the 3.1 litre engine they have two bleeder valves that when you flush the out or they get low on antifreeze they get air in the line and stop the flow of antifreeze getting threw the engine causing them to overheat and possibly damage your engine. Hope this helped out with your overheating problem.

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14 Answers

1999 Pontiac Grand Am Overheating


I had the same problem on my 1999 Pontiac GA 3.4 litre. Replaced a bunch of stuff. It just kept pushing the coolant out the overflow once the temp got to 200 + like to drove me nuts. Ended up being that reservoir. If you measure the O.D. of the cap(brand new cap) and the I.D. of the reservoir filler neck there is no way it will seal(even tried to fit a different type cap,no luck). The system has to be able to build pressure or the coolant will boil out at 212. Causing the coolant to be pushed out the reservoir. Why? you say or How? did the filler neck increase in size. I dont know but GM has write ups about this problem. They say sand it with a piece of sandpaper to smooth it. Maybe someone sanded it way to much?? Around $40 bucks and I was on my way. Hope this helps someone.

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