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Vacuum pump on 760 700 1985

I was given a 1985 760 Turbo with a problem I am trying to diagnose. The climate control is stuck on heat. From previous post I see it could be many things such as the sensors or a vacuum leak, but before I go down that road I have a suspicion it is the vacuum pump. It stays on continually and is incredibly loud. Can anyone tell me if the failure of this pump would keep the auto climate control stuck on heat? Thanks.

Robert







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