Isolating Compressor
NOTE:
The following oil checking procedure details isolating the compressor prior to checking; however, it is possible to discharge the entire system and then check the oil level.
- Connect service gauge set to compressor service valves and open compressor valves lightly (turn in clockwise). Start engine and operate air conditioning system. Slowly turn compressor suction valve stem clockwise toward front-seated (closed) position.
- When suction pressure is reduced to zero or less, turn off engine and compressor and quickly turn (clockwise) suction valve stem in, to full front-seated position. Suction pressure should read slightly above zero. Also turn discharge service valve stem fully in, to front-seated position.
- After service valves are fully closed, a slight pressure Will remain in the compressor crankcase due to remnants of refrigeration mixed in the oil. Loosen oil check plug slowly to bleed remaining pressure. The compressor is now isolated and oil check may be performed.NOTE: Oil level check plugs are located on either side of compressor crankcase; use check plug which is most convenient when checking oil level with compressor on car.
- Fabricate a suitable dipstick according to specifications shown in illustration. Insert appropriate end of dipstick into compressor and measure oil level. Compare measured oil level to specification table. Add clean refrigerant oil if necessary. Replace check plug with clean "O" ring seal.
- When oil check is complete, compressor must be purged of air before operating the system. See procedure as outlined in Compressor Replacement in COMPONENT REPLACEMENT Section.