Question about 2003 Chevrolet Impala

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Heater not heating, but it blows

Have a 03 chevy impala, heater blows but it doesn't get hot, and my thermostat gauge is not working

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Sounds like a clogged heater core, try flushing out the whole system and putting in a flushing Tee on to the heater core hose inside the engine compartment, There will be 2 hoses coming out of the fire wall possibley on the passenger side that go into and come out of the heater core, The Tee can take a garden hose connected to it,[3/4"] hose i think ,measure to be safe all you have to do is cut one of the hoses and install the Tee with 2 clamps and attach a hose, first i would attach 1 side to the Tee and attach the hose but don't attach the other hose just yet ,flush out the heater core first then switch the Tee to the other hose and leave off the other hose so that you flush out the core from the other direction and what ever is clogging up the core doesn't go into the rest of the system.then hook up everything and bring the vevicle up to temp and repeat this process [USE ONLY WATER TO FLUSH OUT ] BE CAREFUL NOT TO BURN YOURSELF WITH THE HOT WATER , PUT A RAG OVER THE TEE WHEN DISCONNECTING THE LAST TURNS ON THE CLAMP.Also change out the thermostat under the hood.

Posted on Mar 05, 2009

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I have a 2003 chevy impala. Just recently come acrossed in issue where the heater blows nothing but cold air even with the temp gauge going as high as it can get. Weather its at an idle or being driven....


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To troubleshoot this types of problem,click the link below :----http://howtobyme.blogspot.in/2012/02/heater-blows-only-from-defrost.html
--------Go through the procedure to confirm the issue.

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http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

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This will help.Thanks.

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1 Answer

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.

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I have a 2000 chevy impala my heat doesn't work,


first it to verify the coolant flow. I suspect the heater core isn't flowing, you may need to take a garden hose and take both heater hoses off, and flush in both directions to clean the heater core. flush in both directions until you get clean water flow. I am assuming the coolant level is OK, and the water pump is pumping and the engine is getting warm enough.

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Temp gauge says hot(goes all the way to left by gas gauge)little bit of coolant under car once in a while but then coolant will be low-There is no white smoke.Doesn't heat or cool well.heater core has...


the coolant could be just overflow,, as far as the temp,, replace the thermostat as a first thing, when your car gets that hot, it causes readings to be sent to the computer that sends mixed signals to other parts of the car, The first thing you should do is pull the diagnostic codes. This will tell you if the thermostat is dead.check the temp sending unit, it is located under the upper radiator hose, 19mm wrench will take it off, it costs about 20 bucks but you also need to replace the thermostat. all in all its about 25 bucks total and all your gauges work fine....

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Oct 16, 2009 | 1997 Chevrolet Camaro

1 Answer

Over heating


sounds like an air pocket or waterpump may be on way out.

Jan 03, 2009 | 2004 Chevrolet Impala

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