1999 Pontiac Firebird SWITCH WILL NOT CHANGE FROM FLOOR TO

Tiny
SWEETNLOW601
  • MEMBER
  • 1999 PONTIAC FIREBIRD
  • V8
  • 2WD
  • AUTOMATIC
  • 108,000 MILES
I have a manual switch. The air is stuck on the settin that splits it between defrost and floor as that is where I had it in the winter.

It will not switch to the dash vents. I've tried banging under the glove box to see if it would jiggle something in the switch or doors to make them move and it hasn't worked.

Any suggestions?
Wednesday, June 17th, 2009 AT 3:01 PM

2 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
If there is an actuator that is vacuum controlled, check the vacuum source.
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Wednesday, June 17th, 2009 AT 3:22 PM
Tiny
SWEETNLOW601
  • MEMBER
  • 3 POSTS
Thank you. We finally found it. It was the 3 way vacuum check valve located in the engine compartment closest to the firewall on the passenger side. It was cracked. Repair cost $6.00 part in stock at NAPA.
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Wednesday, June 17th, 2009 AT 5:37 PM

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