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1999 Ford Expedition

Tiny
COREY POPE
  • MEMBER
  • 1999 FORD EXPEDITION
Air Conditioning problem
1999 Ford Expedition V8 Two Wheel Drive Automatic

i turn on the a/c and it blows fine until I accelerate. I noticed while doing this that I can hear like door shutting inside the dash. Can you tell what may be the problem and about how much does it cost to get it repaired?
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Tuesday, August 4th, 2009 AT 6:06 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
The vent doors are run by vacuum. Chances are there is a loose, damaged or disconnected vacuum hose. When you accellerate, the vacuum from the engine drops; thus, the direction of the air changes.

While you are looking, start the engine. You may actually hear a hissing sound.
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Thursday, August 6th, 2009 AT 11:50 PM

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