I need help... my car is still overheating.. i have put a new thermostat, water pump, and head gasket in my 2003 pontiac grand am V6, and its still overheating.. at first when i drive it on the freeway it will not overheat until i get off freeway and im in town.. once i park it the coolant will come out of the reservoir because its too hot.. i replaced the thermostat two times because i thought the first one was bad.. i did the check in hot water to make sure the second one wasn't.. once the temp goes up it will blow out cold air, but it only does it every so often.. please help this car is driving me crazy and costing me way to much money.. Fans are working and this type of car doesn't have a radiator cap its the same cap as the coolant reservoir... system was flushed after the head gaskets were put in... no leaks from radiator, is it still possible radiator is bad?
SOURCE: 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.
SOURCE: 97 Pontiac grand am overheats as soon as it gets to running temp
If electric fans are coming on, and you have filled the system with the heater turned on high to purge it of air, even though you flushed it, I'd have the radiator flow tested (even when flushing, coolant tends to go around internal blockages, limiting its ability to work correctly) otherwise you need to begin testing from square one like you had never seen it before (don;'t assume anything you did is working) Pressure testing of coolant system, hydrocarbon test at fill opening and engine compression tests are important as well as what I mentioned above.
SOURCE: 2001 pontiac grand am se v6 3.4L overheats-water
is the engine fan coming on? , when the heads were removed ,were they pressure tested. u may need to use a carbon block test from the coolant tank. the liquid will turn a different color if exhaust gas is present in the coolant,which would be a internal problem
SOURCE: 1999 Pontiac Grand Am Overheating
It is probably the problem. To make shure that need to change the gaskets, one of the symptoms use to be thet the temp rises when you are running at speed 50+ average, where is supposed that the car gets a lot of air due by the speed and nobody thinks that will be overheated.
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Belt
Incorrectly routed, adjusted, tensioned, missing, or worn water pump belt(s).
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Oil Pan Gasket - Performance
Ruptured, cracked or leaking radiator hose.
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Radiator Cap
Worn or damaged radiator cap
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Thermostat
Thermostat stuck closed
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Fan Blade
Broken, missing, or defective fan blade(s).
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Water Pump
Damaged, worn or leaking water pump.
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Intake Manifold Plenum - Perform
Leaking water pump gasket.
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Cooling Fan Control
Faulty cooling fan control or circuit.
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Cooling Fan Switch - Radiator
Faulty radiator cooling fan switch or circuit.
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Engine Temperature Sensor
Faulty engine temperature sensor or circuit.
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Temperature Switch
Damaged or faulty temperature switch or temperature switch circuit.
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Fan Clutch
Worn, loose or faulty fan clutch.
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Ported Vacuum Switch
Damaged, leaking, or faulty ported vacuum switch.
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Radiator
Obstructed radiator core or radiator cooling fins.
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Head Gasket - Performance
Head gasket leaking coolant into cylinders
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The reservoir is new also.. just got it about 2 weeks ago cause i thought the same thing and its still overheating..
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