Question about 1999 Pontiac Grand Am GT

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My 1999 Grand Am GT has muliple problems but rite now I'm focused on it over heating. It has a new water pump, new coolant tank, and new thermestat. My car has water flow but is still overheating. Im afraid I may have blown a head gasket, my car has also lost power because of this. What do you think may be wrong, and how do I fix it?

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To check for blown gasket, open radiator cap, start engine, allow to warm up--thermostat open. If combustion gases are leaking into coolant, you will see bubbles come up in the radiator or reservoir (if you don't have a radiator cap).

If not this,

Please see my tip at . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

Posted on Oct 04, 2010


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1 Answer

My 99 grand am is over heating i changed the water pump thromstat antifreeze keeps coming out the overflo tank

I had the same problem with my grand am replace the coolant reservoir tank that should fix your issue

Mar 24, 2013 | 1999 Pontiac Grand Am GT

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I need to know why my grand am is overheating i have changed everything i now could be the problem please help me

check out my heating troubleshooting tips section...have you flushed the cooling system?

Feb 28, 2011 | 1999 Pontiac Grand Am GT

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Tempature is getting hot replaced thermestat

air pockets possibly or your fan is not kicking on. look for a bleeder valve for the coolant and bleed the system when its running, or leave the radiator cap off and let it run for a while then top off system.

Jul 14, 2010 | 1998 GMC Jimmy

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How to remove water pump from 1999 pontiac grand am GT

After you drain coolant remove the larger hose at the bottom of over flow tank and the 2 smaller hoses at the top. remove the 1 bolt holding the overflow tank on and remove tank. Next take serpentine belt. Take the 4 bolts off holding on the water pump pulley and remove pulley. Next remove the 5 bolts holding water pump in. Clean water pump housing of old gasket and clean with alcohol or paint thinner to remove any residue. Use a small amount of RTV sealant along with a new gasket and put in the 5 bolts tightening them by hand. Next tighten the bolt a quarter turn at a time until tight.put on pulley, put in overflow tank and attach bolt and 3 hoses .

Sep 24, 2009 | 1999 Pontiac Grand Am GT

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Screen on dash says "coolent low".

Sounds like a bad thermostat. A malfunctioning thermostat will back up coolant into the overflow. BTW, are you experiencing any problems with the heat or AC? This would also be an indicator that the thermostat is faulty.

Apr 23, 2009 | Chevrolet Venture Cars & Trucks

1 Answer

Coolant pouring out surge tank

if one radiator hose gets hot and the other doesnt, the the thermostat is shot, but you said you replaced it, it is possible the thermostat has been put in backwards

Nov 21, 2008 | 1999 Pontiac Grand Am GT

2 Answers


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

Oct 26, 2008 | 1999 Pontiac Grand Am GT

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