Question about 2000 Pontiac Grand Am GT
2004 Pontiac Grand Am 6cycl 3.4L, car was overheating, replaced thermostat and ended up replacing head gaskets. Car was fine during the summer. Now in winter, I have sporadic heat, sometimes hot, sometimes not. Found a water/antifreeze leak, replaced the water pump and hose w/clamps. When car is filled with antifreeze, heat runs hot, but after 3 days, the air is back to cold and the car is overheating. Will go up to 240, then when I turn ont he heater knob to high, it will go down to 200 (but still no heat). I have not seen any more leaks, don't know where the fluid is going. Also, the knob to change the location of heat/air does not work (ie, feet, face, defrost). Any help is appreciated.
Sounds like you had a sticking thermostat when you replaced the waterpump causing an air pocket. Replace the thermostat, and jack the front of the car so that the radiator cap is highest part of the cooling system. Then run the car and burp the air out of the coolant system.
Posted on Dec 26, 2013
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Posted on Jan 02, 2017
SOURCE: I have a 1999 Pontiac
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.
Posted on Jan 02, 2011
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.
Posted on Nov 19, 2008
What engine do you have? One noted problem with the 4 cylinder engines is the reliability that at some point the intake will crack. I went through all the same things when I bought my 93. Drove off the lot, started overheating, replaced the thermostat and still had the problem without moving from the driveway. Look all around the intake. Make sure car is full of coolant and have the engine running. Most likely you will see a small coolant leak on the backside by the firewall. These cars were known for this problem. By the way if this is the problem make sure you take it to a reputable mechanic, make sure you get a new one installed. I had a used one and had the car back in the shop the next day. It then sat there for 2 more weeks while the used car dealer and I had a "discussion".
Posted on Jan 07, 2009
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