> I posted this question some time back but lost the replies.
> forgive the duplicate request.
> I have a '93 full-size Bronco. I have a problem with the dash
> While accelerating and therefore depleting my vacuum reserve,
> my A/C
> defaults to blowing through the defrost vents. When I
> decelerate, the
> vacuum recovers and my A/C goes back to blowing as it should,
> the dash vents.
> Anyone have any advise as to where to look first for the leak.
> already replaced a small vacuum valve/device under the hood to
> Thank you
My guess is to check the line from engine that supplies vacum to
controls as I suspect it has a small leak in it that is okay when
vacum is high but not okay when vacum is lower because the dash pots
only need 3 to 5 inís of mecury of vacum to work so a leak that takes
it down some from the normal 10 to 15 inchs of vacum in intake when
cruising but above the threshold level of dash pots is okay until you
step on the gas and the source vacum is lower and the leak can no
longer be tolerated and provide enough vacum to move dash pots. Did I
lose you here?
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