88 S-10 pickup A-C Vaccum problem

I have an 88 S-10 4X4 2.8 V-6 when I accelerate the A-C goes from the dash vents to the defrost vents. I suspect a vacuum leak or some other vacuum problem. Any ideas??

Reply to
BIGB
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That sucker have a vacuum ball under the hood?

Doc

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"Doc"

Reply to
BorB

Vacuum leak somewhere in the heater control circuit.

Doc

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"Doc"

Reply to
BorB

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