Question about 1999 Pontiac Grand Am GT

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I have 99 grand am gt and it blows out cold air when i have the heat on sometimes, when it does this the temp guage goes fromm 200 to 260 in couple seconds and. Car stalls out i let it sit for 1 min n restart and and guage goes baco to 200 and i have heat. I have replaced water pump, radiator, intake manifold gasket. What could this be.

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  • 123 Answers

It sounds like your thermostat is sticking. You can tell when it sticks when your temp gauge spikes high and your blower won't blow heat and when it finally opens your temp gauge goes back down and you have heat again.

Posted on May 14, 2010

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Posted on Jan 02, 2017

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I have a 2005 grand prix gt temp guage reads normal and heat is on and warm when start driving heat gets colder or if i change to defrost its cold air doeasnt stay hot car doesnt over heat though changed...


The heating coil is probably getting plugged up. You may have heat at idle or slow speeds, but once you get going, there is not enough coolant going through it to stay warm. Get the system flushed or replace the heating coil.

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Blows cold air when heat is on


If temp. Gauge goes way up check the intake gasket may be blown out and leaking. Take a flash light and shine it under throttle body and look for coolant. Check radiator to make sure it is full only check radiator when engine is cold DON'T OPEN WHEN HOT can cause burns.

Feb 13, 2013 | 2001 Chevrolet Blazer

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Heat goes in and out and the temp gauge goes up and down


Your temp sensor has nothing to do with your heater. The temp sensor needs coolant in order to work properly. So first check the coolant level because if it is low your heater will act the way you describe. Once the coolant gets low enough the heater will blow cold. Another possibility is the radiator cap. After the engine has warmed up it expands when it cools down it contracts. As it is contracting if the cap is weak air can be drawn into the system and cause air pockets to form and will cause the same problem

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Changed water pump. put new thermostat in changed radiator blowing out cold air but temp. guage never goes above 225


first check and see if you have flow through the heater core
start the car and get to operating temp. then grab the heater hoses they should both be hot if not then you have a flow problem
you can try and back flush the heater core or replace it
if the hoses are hot then there will be a problem with the temp door under the dash
hope this helps let me know if you need more info on the heater door

Jan 29, 2010 | 1999 Pontiac Grand Am GT

1 Answer

I have no heat in my 95 4s grand am but. the ac works great.


sounds like you have a thermostat that has stuck open and is letting the engine run too cool. when car is still there is no airflow to cool off radiator and you get heat, while driving the coolant is always cooled off and no heat.

Sep 15, 2009 | 1999 Pontiac Grand Am GT

1 Answer

No heat


try the alternator. if not maybe the water pump

Jan 03, 2009 | 1999 Pontiac Grand Am GT

2 Answers

No heat


sounds like an air lock joe

Nov 22, 2008 | 2001 Jeep Grand Cherokee

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