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Compressor By-Pass Valve Function Check

With compressor by-pass valve removed from the vehicle, apply a vacuum of 9.8-15.7 in. Hg to port "A" of the valve. See Fig 1 . Blow through port "B" to verify air flows. If air does not flow, replace compressor by-pass valve.

Fig 1: Compressor By-Pass Valve

Courtesy of FORD MOTOR CO.