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I have a 1995 F150, 4WD, 4.9L with 156000 miles. The problem is with the vent damper. When I am set to "MAX AC", the damper will shift from blowing thru the vent to blowing to defrost after about 30 seconds.

I have looked all thru the Haynes manual and what info I received with the truck, but can't find what controls the damper.

1: What is controlling the damper (PCM or directly from the selector switch?)
2: Where is the damper located exactly?

Thank you
 

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2013 F-150 XLT 4WD with 5L
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1,777 Posts
The damper switch is electrical and the switch itself could be the issue. The door I believe is vacuum operated in which case you'll need to verify the vacuum hoses aren't leaking.
 
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