Question about 1997 Chevrolet Tahoe
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.
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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Posted on Jan 02, 2017
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Nov 18, 2017 | Cars & Trucks
Aug 03, 2014 | 2001 Chevrolet Tahoe
Try stopping on a steep incline--does the heater stay warm? If yes, what you have is an air bubble that hangs at the heater hose until pressure from the water pump blows thru it as the engine speeds up. Park on an incline, open the radiator cap, run the engine until the thermostat is open, turn the heater on, crack open any/all bleed ports to release any trapped air, and fill the radiator to the neck. Wait until the level stops dropping and make sure bubbles don't continue to come up. If they do, you may have a blown head gasket that will keep forming these bubbles until you change the gasket.
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