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Ventilation problem

Tiny
LASTF
  • MEMBER
  • 1 POST
  • 2000 CHEVROLET AVALANCHE
  • V8
  • 4WD
  • AUTOMATIC
  • 60,000 MILES
My truck sat for 3 days w/o starting, today the clock was off, going to work the air was set to come out of vents but it was coming out of the defroster & it was cycling from heat to air conditioning, change switch to defroster & the air flow went to the floor, I couldn't direct the air flow were I wanted it to go
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Monday, September 24th, 2018 AT 6:41 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
:
I believe the vehicle air flow is directed by vacuum. Check under the dash to look for leaks and listen to see if you hear a hissing sound which will indicate a leak.

Let me know what you find.
Joe
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Monday, September 24th, 2018 AT 6:41 PM (Merged)

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