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A/C from floor and defrost vents only

Tiny
CHEVYBLAZERAZ
  • MEMBER
  • GMC
I have a 1996 Chevy Blazer with 150,000 miles. The air from A/C and heat only comes out from floor vents and defrost windshield vents. The main face forward vents do not work. I did hear a "thump" as I was driving and this problem has been since. This happens no matter where the setting knobs are positioned at. What could be the issue and is it expensive to repair?
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Saturday, April 8th, 2006 AT 5:26 PM

1 Reply

Tiny
KENB79764
  • MECHANIC
  • 52 POSTS
This normally indicates you have a vacuum leak to one of the heat/ac controllers under the dash. A vacuum leak puts the system into a safe mode so that you have defrost ducting if vacuum fails to another controller.
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Sunday, April 9th, 2006 AT 8:59 AM

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