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My Silverado is a 1500, 4

Tiny
CKUENY
  • MEMBER
  • 2004 CHEVROLET SILVERADO
  • 20,000 MILES
My silverado is a 1500, 4.8 engine. Recently when starting the vehicle to warm up, the hvac system will not blow hot air. The hvac does work but only blows cold air. It is not until I put the truck in gear and start driving for the air to be hot. What could be causing this?
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Saturday, January 26th, 2013 AT 2:37 AM

3 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Should have no relation to the shifter. How long sitting will it take for heat to come out?

Roy
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Saturday, January 26th, 2013 AT 2:38 AM
Tiny
CKUENY
  • MEMBER
  • 2 POSTS
I have had it running for at least 30 minutes with only cold air blowing. But once I start driving the hot air will blow instantly.
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Wednesday, February 6th, 2013 AT 1:24 AM
Tiny
JJ58551
  • MEMBER
  • 33 POSTS
Could be thermostat. Check coolant. As well.
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Monday, February 11th, 2013 AT 3:43 AM

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