Question about 1999 Pontiac Grand Am GT

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COOLANT I have a pontiac 1999 grand am 3400 replaced radiador and water pump and theromsta and replaced intake gasket, replaced radiador cap and still amost all the water comes out the over flow just before the fan turns on.... can someone help

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  • Anonymous Dec 14, 2008

    Water keeps getting into the water lines. I have changed the water pump. The problem I am having is that at a certain temperature the heater will blow out hot air and then when the engin is running a little longer it starts blowing cold air. When it does that I take the heater hose off to get the water to move again. After driving it a little it starts blowing the water out of the overflow tank and I can hear air in the water lines. I think the intake gasket is out. I'm not to familiar with G.M. motors. I need a engine diagram so I can do the work myself.

  • ra1owens Jan 19, 2009

    there is air blowing thru however it is not hot air, i would like to know what i can check to fix this.

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  • 1,011 Answers

Have you properly bleed the coolant system should be two bleeders on your car over the tstat housing and also water pipe on front passenger side

Posted on Jan 24, 2009

My car runs good great heat........runs for 20 mins shut it off let it cool down start it back up and there is no coolant going to the themostat......then the car gets to hot

Posted on Oct 26, 2008

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04 Grand Am GT. Just had head gasket replaced but it's losing water somewhere. Nothing obvious. Could it be cap on coolant reservoir?


Is there any water in your oil? An Intake gasket leak could be the problem.. Is there water vaper in the exhaust, maybe a cracked head...Has got a 3400 series engine? Not sure a Grand am has a 3400 in there line up,There are plastic 90's in the heater lines on the front of the motor that can be pretty sneaky,dripping where you can't see it very well...Have your rad. cap checked or replaced.... Hope that helps ....

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My grand am still overheats even after i changed the termostat and water pump plus, the fan only runs when the temp sensor is unplugged


I had the same problem with my 1999 grand am .I changed water pump, thermostat. I heard the Pontiac engines , 3.4 had overheating problems one is the intake gasket if your losing water but don't know were its going its leaking at the intake gasket and burning off or if you check the oil cap or the dip stick and theres a milky substance on them it would be your head gasket I had to change my head gasket and while I was there I changed the intake gasket too. I haven't had any problems sence I changed them hope this helps. Jack

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99 pontiac grand am. replaced head/intake gaskets, thermostat, reservoir and cap. checked water pump. bled several times. when idling, it will get to about 205-210 and have heat. drive it a mile and...


SOUNDS AS IF MAYBE ONE OR TWO THINGD GOING ON, 1 the block could be craked ,2, radiator could be clogged .3head could be bad, first you need to find out if the is combustion in the coolant system, the is a kit you can bye called a BLOCK TESTER KIT you can pick this up at local parts store (napa has it ) and read and follow instructions, that will tell you alot there if its internal or cooant related

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Usually intake has to do with the induction system, as in intake manifold , The intake manifold can have several types of leaks, the intake can have a vacuum leak, oil leak, coolant leak or a combination of any of the before mentioned....hope this helps,

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Coolant is blowing out res. cap when I rev the engine.


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Aug 29, 2009 | 1999 Pontiac Grand Am GT

1 Answer

OVERHEATING


Normally it is the head gasket not the manifold gasket that causes overheating, it does it by cracking and allowing water from the coolant system to be blown out of the exhust or get dumped into the sump.

When you start the car is there water coming out of the muffler

If not then dip the oil , is it like a thick chocolate milk shake

Final check is to take the cap off the radiator or header tank and see if there are lots of air bubbles coming up.

Any of the above means a shot head gasket

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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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