Question about 2000 Pontiac Grand Am GT

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2004 Pontiac Grand Am 6cycl 3.4L, overheating issues.

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.

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  • 94 Answers

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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  • Cindy Seibert
    Cindy Seibert Dec 26, 2013

    Thank you for your response, but I have done that as well. I don't know where the fluid is going, it is not leaking out. Can it be evaporating? When I noticed that I lost the antifreeze (because it is green), that is when the radiator hose was replaced. Now I don't see any leaks, but every 3 days, I have to put fluid AND I don't have heat. So when fluid goes in, I have heat and car runs normal. Then 3 days later I lose the heat and the temp gauge starts to move up. Today the temp gauge spiked to 240, but when I took off at a green light, it immediately went down to under 200. It does not make sense that the temp gauge would spike...the car was not totally warmed up yet. Thanks again....

  • Christopher Tyler
    Christopher Tyler Dec 26, 2013

    Check your oil before you drive any more and see if it looks(colorwise) like a chocolate milkshake and is almost all the way to the top of the oil dipstick.

  • Christopher Tyler
    Christopher Tyler Dec 26, 2013

    If it has any type of odd coloring to the oil DO NOT DRIVE. You could be having a internally leaking gasket.

  • Cindy Seibert
    Cindy Seibert Dec 26, 2013

    Thank you Christopher Tyler, but the oil is fine. My husband has checked numerous times and it is not like a choco milkshake. That is what is so puzzling with this issue, my husband (who is awesome with my car), has checked and re-checked everything.

  • Cindy Seibert
    Cindy Seibert Dec 26, 2013

    We will keep at it and hopefully be able to post some answers in the future. Thanks again.

  • Christopher Tyler
    Christopher Tyler Dec 27, 2013

    If the antifreeze isn't leaking externally on the engine there only a few places that the antifreeze can go. It is either in the engine oil, the transmission oil, or it is leaking into the passenger compartment behind the dash board and would make the passenger compartment smell. Unless he your husband is just filling it with water, then it would be just evaporating. Next, I would perform a cylinder leak down test and a compression test. The only other thing I would tell you to do is fill it with antifreeze and add a dye to it that will glow under a black light. You can purchase a kit to add the dye and comes with some yellowish looking glasses and a black light. Then run the engine and look for the glowing dye with the glasses and black light. Good luck and keep me updated. I will let you know if I think of anything else.



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Posted on Jan 02, 2017

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SOURCE: 97 pontiac overheats with thermostat

head gasket, definitely
check your oil and see if it is mixing with anti freeze

rate my answer

Posted on Dec 05, 2010

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

  • 56 Answers

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.

Posted on Nov 19, 2008

  • 35 Answers

SOURCE: '94 grand am cooling system failure

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

  • 212 Answers

SOURCE: 1998 Pontiac grand prix gt leaking power steering


Posted on Feb 01, 2010

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