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1968-Present E-Series Van/Cutaway/Chassis Econolines. E150, E250, E350, E450 and E550

AC controls...

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Old Jun 13, 2010 | 09:49 AM
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From: Laquey, MO
AC controls...

I'm having problems with the vacuum controls on the '99. It acts like there is insufficient vacuum to operate the various doors and controls in the system. For example, if I stop at a light, the blend door will open up and the air will get warm until I step on it a bit and it snaps back and it's good and cold on the AC side again. I also have air coming from the floor heat vents when the switch is on vent.

It sounds, to me like the selector switch is acting up or I've got a bad connection somewhere and it is losing the vacuum. Any suggestions as to where to look first?
 
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