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Home >> Ford >> 1991 >> Bronco 4.9 Y, Standard, M5OD-R2 >> Repair and Diagnosis (Single Page) >> Heating, Ventilation & A/C (HVAC) >> A/C Compressor Oil Checking >> Isolating Compressor
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Isolating Compressor

NOTE: For compressor application, see A/C SPECS In The AIR CONDITIONING and HEAT section.
NOTE: Only compressors with stem-type service valves can be isolated.
  1. Connect manifold gauge set to compressor service valves. Ensure valves on gauge set are closed. Place both valves on compressor in the mid-position. Start engine and operate air conditioning.
  2. Slowly turn compressor suction valve clockwise toward closed (front-seated) position. When suction pressure is reduced to zero, turn engine and compressor off and quickly turn suction valve stem inward to the full front-seated position. Turn discharge valve into front-seated position.
  3. Loosen oil level plug to release internal pressure in the compressor. Compressor is now isolated from the rest of the system and service valves can be removed from the compressor.
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