Question about 2003 Chevrolet Silverado 2500HD

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I have Chevy Silverado 2500 Diesel that won't heat up

I have changed the heater core and the thermostats and the truck will still not blow hot air. Its warm but not hot.

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  • northernauto Dec 24, 2008

    I forgot to mention this truck has a 12 inch lift kit

  • northernauto Dec 29, 2008

    It did help a little bit but it still isn't hot. I'm not sure if it's because of the lift kit.

  • Ric Regier
    Ric Regier Mar 14, 2009

    Problem is the thermostat control in the cab can be turmed to high 82* and not heat or very little... The engine can run 190*+ at 80 mph no change... Just have new radiator put in because of lines to trans broke and filled trans with rad fluid, it was flushe and is clean... I think there is or it has something to do with the thermostat control in the cab I can go to the cold side and the temp and ac unit will kick in and cool really good, but on the heat side still low heat...



    02 Duramax crew cab...

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Replace thermostat, stuck in open position, not allowing engine to warm up properly.

Posted on Oct 30, 2016

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If your truck has a body lift the space between the bumper and the lower core suport needs to be filled. and if its a suspension lift the air that is now geting redirected up from the front axe needs to be blocked

Posted on Jan 26, 2009

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Did you put on the cold weather bra? Try that,should help....

Posted on Dec 24, 2008

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