Question about 2004 Chevrolet Impala

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Engine running hot light came on my 2004 Impala.. I turned heater on high and only cool air came out. The light went out and temp went down.

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IT SOUNDS LIKE YOUR THERMOSTAT IS STARTING TO STICK. REPLACE IT, IT'S CHEEP AND CAN'T HURT IN A 7 YEAR OLD CAR.

Posted on Mar 25, 2011

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You may have a thermostat that is starting to give you problems..it may not be opening up when it is supposed to..that would be my first suspicion.. should be located inside upper radiator hose where it attaches to the front of the motor.. replace it or test it to see if it is opening up in boiling water.. I personally would just replace it, it should be opening up between 160-180 degrees..

Posted on Mar 25, 2011

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My 2010 dodge journey is running hot and the heater is blowing cold air. Temp goes back down to normal while driving. No indicator lights r on. Is it the thermostat or heater core?


Most likely neither is the problem, to verify the heater core is ok go under the hood and touch the heater core coolant supply hoses (hot engine) one will be really hot and one a little cooler, if this is the case the heater core is ok and you have another problem, that other problem is most likely a failed part or parts called the air temperature control blend door motor or door is defective. Also I doubt the engine is overheating, it gets hotter while sitting in traffic because the electric fan that cools the engine only comes on at about 225 degrees Fahrenheit. If you had an overheat condition the check engine light would also come on to alert you of the overheating condition.

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04 impala heat stopped working but fan works


Are the heater hose hot to the touch ? Two hose's from the engine that go to the firewall an into the heater core ! Manual or automatic temp. control ? Do you feel air blowing out of the vent's ? cold ? Temp blend door actuator could be bad !

Dec 01, 2016 | 2004 Chevrolet Impala

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Temp gauge fluctuates and heater doesn't work


This has got blown head gasket written all over it. How many miles are on the vehicle. Whens the last time the thermostat was changed?

Feb 18, 2013 | 2004 Chevrolet Impala

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My 1999 Chevy Malibu runs hot? It started when it overheated. We changed the thermostat, then water pump, then temp sensor gauge and the temp gauge goes high but only when the heater stops blowing hot...


Air pockets will make the guage do that, and also cause your heat to come and go. Also, a poor radiator, as in rotting, or plugged up, will cause high temperature issues.

Sep 20, 2011 | 1999 Chevrolet Malibu

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2004 impala..The heater blows cold air when at idle or when i stop at a stop sign. When I am driving the heater is blowing hot air. the antifreeze level is OK and the engine is at operating temp. Any...


A couple of things come to mind. One is the thermostat is hanging open. The other is the cooling fans are running when they shouldn't. With the car idling, open the hood and see if the fans are blowing. Do you have a temperature gauge in the dash? Should be reading about 200 degrees all the time. Maybe a little less at highway speeds but not below 190 degrees.
The other thing is the heater core may be plugged. Have you changed the anti-freeze and flushed the system recently? Added any StopLeak to the radiator?
Also... if the heater temp controls are activated by vacuum (I'm not sure on your model), you may have a leaky vac hose to the heater control panel.
Could be any of these and could something else. I tried to hit the obvious ones... :)

Good Luck.

Nov 23, 2010 | 2004 Chevrolet Impala

1 Answer

2004 cheverolet impala 3.4L engine - Started running hot. Had never changed antifreeze, bought a flush and refilled with antifreeze. Ok for several weeks, started running hot again. Replaced the...


Sounds like you have an air;lock in your cooling system.Try placing a bleeder on the return hose to the heater core ........looks like a small tap

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4 Answers

2004 Chevy Impala no heat from defrost or heater


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Sep 22, 2009 | 2004 Chevrolet Impala

1 Answer

Temperature/heat wont work/dashboard lights on and off


It sounds to me like you're low on coolant. When you checked the coolant level, did you actually open the radiator cap and make sure the radiator is full? The plastic tank you generally add coolant too is actually an 'overflow' or 'reserve' tank. There is a hose that runs from that tank to the top of the radiator so if the radiator gets low on coolant, more coolant -should- run in from the overflow tank. However in practice this does not always work. I have a Jeep that leaks coolant and experiences this exact same problem. Coolant will not run from the reserve tank into the radiator because the hose is plugged up, and whenever the radiator gets low on coolant the temp gauge will go real high and then drop, and the heater doesn't work well. This is because the cooling system of your car is supposed to be a closed system, full of coolant and no air. When coolant leaks out, the space it used to occupy is now occupied by air, which does not transfer heat well. When 'air' is passing through your cooling system, no heat can be transferred from your engine to the heater and radiator, resulting in a hot engine and no heat at the heater. Then when a pocket of water passes through the system, the temperature gauge quickly falls as the water absorbs the heat from the engine. The hot water that cools the engine is where the heater gets it's heat from as well, so when water passes through the heater core, the heater works, but when it's filled with air, it doesn't.

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