Question about 1994 Pontiac Grand Am

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'94 grand am cooling system failure

Replaced the rad. core, water pump, head gaskets, TCS, heater core and thermostat in 7/08 and the car was running great until a couple of days ago when i lost heat in the vehicle and then it started to overheat. no visible leaks but when i make sharp turns i can hear boiling liquid. I pulled the thermostat to avoid overheating but to no avail....where am i going wrong?

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  • loman17 Jan 07, 2009

    this is a 3.1 6 cylinder. at this point im thinking i have a warped head. itll build up some heat, enough to run the heater but the warmer it gets the less heat i maintain from the heater core and

    the more shell boil over.

  • loman17 Jan 08, 2009

    hmmm tried the h2o trick with no sulfur smell...could it be the intake manifold gasket? im thinking id see excessive steam in the exhaust.

  • Anonymous Jan 09, 2009

    its definitely the intake manifold gasket. the water circulates but disappears fast because itse getting sucked into the combustion cylinder little by slow with eack stroke of the piston. because its such a minute leak and its combined with the fuel at an atomized level its literally burning up with the fuel when the cylinder fires.
    I found an intake manifold gasket set for around $45.00 from Advance auto parts. a relatively simple procedure to replace other than having to remove the power steering pump to get at one of the manifold bolts. and be very careful pulling the fuel inlet apart as the "o" ring is very difficult to find and replace as it needs to be gasoline compatible. Good luck and keep me informed on how you make out.

  • Anonymous Mar 18, 2014

    car is overheating changed heater core , water pump ,flushed cooling system ,



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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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  • Michael Sharar Jan 07, 2009

    Pressure test the coolant system. This may show exactly where the leak is also have you checked your oil for any water contamination? Another way to check for a warped or cracked head is to completely drain the coolant and fill back with straight water. When you do this if it is a head problem you will get the sulfur ( rotten egg smell).

  • Michael Sharar Jan 08, 2009

    You would should see steam, I'd lean towards maybe having a bad gasket but I think that either you would see water somewhere or something. Did you try to pressurize the coolant system without running the vehicle? Your vehicle is starting to sound like the one that I am working on at work, it has a coolant leak, you can see it leaking down the back of the motor, across the intake and under the turbo but you just can't see where it is coming from. With the boiling over that sounds like it's blocked up not allowiing it to circulate. I'll have to ask around to see if someone else had the same type of problem.

  • Michael Sharar Jan 10, 2009

    I asked a friend of mine, he dealt with the same type of problem. He told me that those engines would develop a leak from the intake above where the transmission mounts to the block. He stated that the leak is very hard to find but most of the times that he has had to work on a grand am with your engine that's where he would end up finding it.



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