Question about 1997 Chevrolet Tahoe

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2004 Chevy Tahoe. Heater working only at higher speeds.

My Tahoe heater only pushes warm air when my driving speed goes above 30 mph. My engine temp gauge fluctuates from normal to slightly higher as the heater goes in and out. While idling my engine temp gauge rises and my heater blows out cold air. Then when I start driving my engine temp gauge drops and my heater start blowing warm air again. Does anyone have an idea what might be going on? Thank you.

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  • jholman71 Mar 05, 2009

    Low coolant level. All is good again. I will have to keep my eye out for leaks. Nothing noticeable at this time. Thank you.

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  • Chevrolet Master
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You have air trapped in the cooling system. A good indication is that one or both of your heater hoses going into the heater core are cold when they should be hot.
Park facing uphill, raise front of vehicle so radiator cap is higher than top of engine. (You want bubble to get to radiator and out the cap.)
Leave cap on but loose, so bubble can purge.
Turn heater on.
Fill radiator and reservoir with 50/50 mix of antifreeze.
Start engine and run at about 1500 roms until the engine warms up and thermostat opens.
You will know themostat opens when top radiator hose is hot indicating coolant is flowing.
Shut off engine.
Fill radiator and reservoir. Install cap.

please Rate as fixya if this works. good luck

Posted on Mar 04, 2009

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SOURCE: 2004 Tahoe Heater Problem

check coolant level ,must be low ,chck for coolant loss

Posted on Mar 05, 2009

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Posted on Jan 02, 2017

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