Abstract: A method of evacuating an air conditioner utilizes the vacuum from the air/fuel manifold of a gasoline internal combustion engine. A do-it-yourself kit for so evacuating an air conditioner includes a hose so constructed as to allow one end to fit the Schrader valve on the discharge side of the air conditioner and the other end to fit a variety of sizes of tube members which extend from the air/fuel intake manifold, for example, the tube member which is connected to the positive crankcase ventilation (PCV) valve. The hose includes a one way valve which prevents flow into the compressor of the unit but permits flow out of the compressor.