Question about 2003 Chevrolet Malibu

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Thermostat replacement I was driving last night and noticed that my heater wont work it blows nothing but cold air. The needle that tells you the engine is heating up gets to the quarter mark and stops...it doesnt move up or down. My guess is the thermostat. I have the part but i dont know where its located or the steps necessary to replace it.

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Thermostats rarely fail open.

Does the radiator have plenty of coolant?

Check the valve that controls water flow to the heater core. You can usually go to your local repository library, and they will have factory service and repair manuals (Not Chilton's or Motor's, but by the factory) for your specific vehicle, including troubleshooting charts and repair methods.

Posted on Jan 16, 2009

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My heater was working fine last week ,then i noticed it was getting cooler in car then it just blows col to cold air this week it a 1977 300d


If the car overheats also, replace thermostat.Could be heater core needs to be replaced, Any water on passenger side floor?, or smell of coolant?or are windows misty on inside of car?when you slide control from cool to heat it is supposed to close a door that lets in cold air, make sure thats working, usually you can hear it shut. lastly, check water pump. You do have enough coolant in system right?

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the one thing that comes too mind is trapped air-when i do a radiator I always start up and warm engine so thermostat cycles a few times to make sure that you dont trap air in colling system. you did not say so but if you didnt, its really not a bad idea to change thermostat and gasket when digging into colling system. they are usaully fairly cheap.

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My 2003 Rendezvous heater blows cold air when it is stopped, and it blows hot air when driving. I have topped off the resevoir fill tank with coolant. The engine is not overheating and I don't notice any...


It may just be the way the car works. I have a 2005 Altima and it does the same thing, but just doesn't blow really warm air. Try putting the air on recirculating, that may help a little. If it's still REALLY cold when you are stopped, I would check/replace the thermostat first. If you want to check the thermostat to see if it's working yourself, just remove it, and inspect it while it is cold, then put it in a pot of boiling water for 3 mins, inspect it, if the valve has opened it is okay, if it looks the same (aka valve was open to begin with) it may just be staying open and it should be replaced.

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The heater will not blow warm air until you start driving. The fan blows but its cold air. Once you start driving the air turns warm. Why?


There may not be enough coolant in the system. What happends is the heating core is nothing more than a small radiator inside the car. If the fluid is low the heating core is empty. But once you start driving the water pump works harder and fills it up. Another possible cause is a sticking thermostat. If its stuck open the engine cant retain water to heat it up. Thus blowing cold air. Whith the engine cold remove the radiator cap and check your coolant level. If it is full a replacement thermostat may be needed. HTH and dont forget to rate.

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Check the thermostat. You'll find it by following the upper radiator hose to the engine. Often a cause of this may be some loose particle in the thermostat and you just need to clean it.

You can test the thermostat by putting it in a pan full of water. The thermostat should pop open at around 200F or 92C temperature.

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Hello. You are in luck. I just had this same issue in my shop this week. We changed the thermostat, and replaced the coolant. Fixed it right up. Since you did not mention a new thermostat, that would be my next move, if I were you.

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this is caused by the main cabin temp blend door actuator motor, in order to replace it or even check it the dash must be pulled out.

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1 Inspect Cooling System Mix Coolant level low or flow is restricted. grey_line.gif 2 Inspect Thermostat Thermostat stuck closed grey_line.gif 3 Inspect Heater Control Valve Leaking or defective heater control valve. here something to help u

Here to help Shaun

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