Compressor Oil Check - General Procedures: Notes
CAUTION:
When discharging air conditioning system, use only approved refrigerant recovery/recycling equipment. Make every attempt to avoid discharging refrigerant into the atmosphere.
Some models have compressor-mounted service valves that allow oil checking by isolating the compressor. On all others, system must be discharged and compressor may need to be removed to check oil. After oil level is checked and adjusted, A/C system must be evacuated and recharged.