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Vents stuck in defrost

Tiny
GARRETT CRAWFORD
  • MEMBER
  • 1999 FORD F-350
  • 7.3L
  • V8
  • TURBO
  • 4WD
  • AUTOMATIC
  • 253,000 MILES
Bought a truck with vents stuck in defrost. I can turn dial to any position, even max AC and still stuck on defrost. With that case how do I fix the issue? Also, does the AC turn on when vents are in the AC position? I have turned dial to AC and max AC to see if I can get cold air out of defrost vents. Does not seem to kick on AC.
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Tuesday, July 18th, 2017 AT 11:41 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,861 POSTS
Hello,

Please Check the vacuum lines headed into the firewall which run the defroster and heater. Here is a guide that should help you get the problem fixed.

https://www.2carpros.com/articles/air-vents-stay-in-the-defrost-position

Please let us know what you find.

Cheers, Ken
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Wednesday, July 19th, 2017 AT 1:14 PM

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