THE HAVE SYSTEM IN THE TRUCK BLOWS FINE AND AT ...

  • Tiny
  • ckueny
  • 2004 Chevrolet Silverado
  • 200,000 miles

The have system in the truck blows fine and at the appropriate levels. The problem I have is when I start the vehicle to warm it up, it will not blow hot air until the vehicle is put in gear and driving down the road. Any suggestions as to what is causing this?

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Tuesday, February 5th, 2013 AT 11:31 PM

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  • Tiny
  • hmac300
  • Expert
  • 43,741 posts

Might be air in system check for full coolant level. It may also be a an actuator not fully open. Try pulling hvac fuse for 60 seconds then reinstalling that resets actuators but you wouldn't know until next time you fired truck up

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Wednesday, February 6th, 2013 AT 2:59 PM

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