Question about 1999 Pontiac Grand Am GT

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No heat when i turn the car on and it is warm, running al least 1/23 hour, i turn the heat on, and only cold air comes on, could it be the thermostat or ?? I have the same prob with my 99 grand am....The temp is just in the middle not overheaing...I checked the antifreeze level and filled it but continues to blow cold air...not sure what is wrong...maybe need new heater coil

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Try the alternator. if not maybe the water pump

Posted on Jan 03, 2009


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Engine running cold. I noticed my 99 Altima would start running at normal temperature but when I turned on the heater the thermostat gauge would drop to cold and not blow any hot air. Is it a faulty...

-Thermostat is not control the heater. It control only temperature in the engine.
-If you have no heater then check the following:
Make sure engine is cold before perform check.
-Check radiator is full of water or not. If not then fill it up
and try run like normal and turn on the heater.
-If now you have heat then you're done.
-But still no heat yet then cheek:
The heater valve. Is it open properly when you switch to hot or cold? If yes then NOT THE VALVE. Next lose both heater hoses from the engine and flush with garden water hose from one end and the other until you see water come out either end. Now connect back to the engine and top of the radiator more water.
You should be good to go now.

Good luck and stay warm


Jan 03, 2018 | Cars & Trucks

1 Answer

Blower control

Sounds like a thermostat and/ or the system is low on coolant.
Its probably not going to reach 200 degrees when the outside air temp is below freezing, but you should get plenty of heat if the system is working correctly.

Jan 23, 2014 | Pontiac Grand Am Cars & Trucks

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I have a 2001 silverado 5.3l 4x4. My heater blows warm air sometimes and then blows cold air. My thermostat stays at a steady 200 degrees when warmed up. I filled my coolant and didn't have any leaks, does...

Sounds like air in the cooling system. Try taking radiator cap off and letting the vehicle run with heater on high. As bubbles come out add coolant. This may take 20 minutes to a half hour.

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1 Answer

My 2006 charger even after running for an hour when the heat is turned on it drops the engin temp til its blowing cold air

check thermostat in radiator, if stuck open, could cause motor to take an extremely long time to produce warm air

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1 Answer

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Hope it is just air in the system not the heads!

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