Question about 1999 Chevrolet Silverado 1500

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1999 1500 silverado heater

Turned the control to heat now thats all it does is blow hot air

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  • webbow Feb 22, 2009

    Is it easy to fix, it it easy to get to? May just be a dirty door, or is it a electronic or motor of the door problem? Any info would be appreciated.

  • streetrder81 Apr 25, 2009

    my 99 chevy truck's a-c was working good on sunday afternoon, monday morning it was cold and i turned the temp switch on hot, in the afternoon i switched back to cold andits been blowing hot air ever since. it is full of freon as we checked with the gauges. any ideas?

  • Anonymous Mar 19, 2014

    whether it is defrost or fresh air or heater setting or turned to coolor heat

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  • Chevrolet Master
  • 60,867 Answers

Sounds like the blend door in the ducting has failed, this door is what controls the temp of the outlet air by blending heat and outside air or AC cooled air.

Posted on Nov 07, 2008

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2000 chevy silverado not blowing hot air


1: not enough liquid in the system (air in the heater core)
2: inoperative heater valve not allowing hot liquid into the core
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A clogged heater core will have one hot hose and one significantly cooler hose at the firewall connection; easily tested by hand. a good core will have both hoses very hot to the touch when the heater is on full blast.
Make sure that the system is full and at operating temperature, and the heater controls set on full heat. Feel the hoses at the firewall; if they are both too hot to touch then the problem is in the heater box or controls.

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