95 F-150 5.0 AC

Tiny
CFILER
  • MEMBER
  • 1995 FORD F-150
My AC will go from max ac to defrost by exelerating. Can you tell me why this happens?
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Friday, August 17th, 2007 AT 10:18 AM

2 Replies

Tiny
INDYUKE
  • EXPERT
I'm sorry cfiler, my expertise mainly lies in Ford and Chevy drivetrains, but I will answer your question the best I know how.

The heater control in your truck relies on vacuum to move the heater doors in the dash. My guess would be that the heater control isn't working the way it should and allowing unmetered vacuum to bypass it and adversely effect the heater doors.

Someone else here may be able to shed more light on this. I hope this helps.
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Saturday, August 18th, 2007 AT 8:42 PM
Tiny
BMASTERJERRY
  • MEMBER
Indy is correct. Also there's a vacuum reservoir and a vacuum check valve in the system that may be at fault.
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Sunday, August 19th, 2007 AT 11:49 PM

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