Mechanics

CHEVROLET SILVERADO COOLANT PROBLEM

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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Ckueny
January 26, 2013.




Should have no relation to the shifter. How long sitting will it take for heat to come out?

Roy

ASEMaster6371
Jan 26, 2013.
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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Tiny
Ckueny
Feb 6, 2013.
Could be thermostat. Check coolant. As well.

Tiny
Jj58551
Feb 11, 2013.

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