Truck Air Conditioner question

Wesley Stephens · Jun 15, 2010

The air conditioner on my 95 F-150 blows out of the dash vents when idling, but when the throttle is opened and the vacuum drops, it switches to blowing out of the defroster vents. Does anyone know how to fix this?

old wrench · Jun 15, 2010

There is a vaccum leak somewhere.At idle the vaccum is strong enough to overcome the leak.

ASEguy · Jun 15, 2010

Most vaccum operated HVAC controls have a vaccum check valve under the hood in the plastic vaccum line. They are about the diameter of a dime and only allow vaccum in one direction. Look near the firewall about the middle of the truck.

rrlund · Jun 15, 2010

My 85 F250 does the same thing. I'd sure like to have it fixed.

Anonymous-0 · Jun 15, 2010

You have a vac leak somewhere . Or bad control switch in the dash. It controls vac flow to actuators . I have see few of them that leaked . Smoke machine will find these leaks in a hurry . Lot of shops have them now . Save time and headaches .

Truck Air Conditioner question

Wesley Stephens

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old wrench

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ASEguy

Well-known Member

rrlund

Well-known Member

Anonymous-0

Well-known Member

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