A/C vents close after a short time

LAWRENCE POWERS

MEMBER
1999 FORD F-250
7.3L
V8
4WD
AUTOMATIC
194,000 MILES

A/C will blow cool air for about ten minutes then the vent will close for about five minutes. I changed the vacuum pump and it still does it.

Friday, June 22nd, 2018 AT 6:36 PM

1 Reply

ASEMASTER6371

MECHANIC
52,797 POSTS

Good morning.

Do any of the other doors close when this door closes?

I attached a vacuum chart for you. It may be the vacuum motor itself.

The motor is behind the glove box. Make sure it has vacuum to it to work.

Roy

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