Question about 2004 Chevrolet Tahoe

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I have a 2004 Tahoe and noticed that when operating the heater function this morning, the air was cold. When I drove it for a bit, it started to get warm again. Also, noticed the temp. going over normal (back and forth). I checked the coolant in the reservoir and it was low. Filled it up and problem seems to be fixed for now. I noticed no leaks at this time. The water pump was replaced about 3 months ago!!! Is this a known problem with Tahoes that the antifreeze levels go down?? PLease advise on any other things I should look for. Thanks!!

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Head gasket leak will act that way when an if it gets bad will smoke white exhaust.will also leak antifreeze into oil so watch oil an frequent oil changes might extend time but will ultimately need new headgasket to avoid damage to engine...think about repairing before damage 2engine.

Posted on Mar 21, 2011

  • chiefboggess Jun 27, 2011

    Any time you dont have heat coming out of the dash usualy means you are low on coolant. If you are low on coolant you will need to pressure test the coolant system, usualy 13-15 lbs of psi will do the trick. This way you will be able to locate the leak. if you dont see any external leaks then its internal. If you can pull the plugs and drop the oil pan, this will show where the leak is comming from. Most of the time its a head gasket issue. you will need to fix asap or internal damage will happen ( collapsed lifters, spun bearings, thrown rod, ect.) If its not a head gasket then you will need to have the block and heads checked out. The best process is "magnaflux".. This will show if there are any cracks in the blocks. If you just change the gaskets and let it fly without determining the real fault it could cost you a engine later. Take the time and check it out and it will save you lot of money later.

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