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Isolating Compressor

  1. Connect manifold gauge set to service valves on compressor. Close both gauge valves. Open both service valves to the mid-position.
  2. Start engine and operate air conditioning. Turn suction service valve slowly clockwise toward front-seated position. When suction pressure is reduced to zero or less, stop engine and quickly close suction service valve (front-seated).
  3. Front-seat the discharge valve. Loosen oil check plug slowly to release any internal pressure. Service valves can now be removed from compressor and compressor removed from vehicle (if necessary). Purge compressor after servicing.
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