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1994 968 Air flow from A/C

Heating and Ventilation

Vehicle Information: Model(924/944/968): 968; Year: 1994; Body Type: Coupe; Total Mileage: 33000;

With the A/C on, when I accelerate (normally, doesn't require full throttle to happen) there is a quite noticable reduction in cold air flow (no change in fan speed). It's like an air mixing flap is partially closing. Remembering the behavior of the vacum operated wipers on my first car, I suspect a vacum leak or a failing vacum motor somewhere. If that sounds right, have you any suggestions on where to look, how I might find it, what tests I could do? Is there a vacum tank somewhere? Would a diagnostic readout at the dealer's be able to pinpoint the cause, or just confirm a leak?

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