Question about 2004 Chevrolet Tahoe

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2004 Tahoe Heater Problem

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

    Coolant level was low. Filled and now everything is back to normal. Can't see any noticeable leaks, I will have to keep an eye on it. Thank you.

  • Anonymous Mar 13, 2014

    When I turn on my A/C or heater the tempature gauage shows I'm overheating.

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  • 366 Answers

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

Posted on Mar 05, 2009

  • carhob Mar 06, 2009

    keep an eye on water pump weep holes

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These details will help.
Thanks.

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I have a 2004 tahoe when I start it to heat it up, the temp gauge goes up like usual, but will not blow hot air until I start driving down the road? I even let it warm up for about 45min. and still would...


Hi, the likely problem is a bubble forming in the system, possibly due to a head gasket failure.

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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Shut off engine.
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please Rate as fixya if this works. good luck

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