AC–76 AIR CONDITIONING SYSTEM – REFRIGERANT VOLUME Sight Glass N00744 REFRIGERANT VOLUME REFRIGERANT VOLUME INSPECTION 1. RUN ENGINE AT APPROX. 1,500 RPM 2. SET TEMPERATURE CONTROL AT MAX. COOL 3. SET BLOWER SWITCH AT "HI" 4. SET AIR INLET CONTROL AT "RECIRC" 5. TURN A/C SWITCH ON 6. FULLY OPEN DOORS 7. INSPECT AMOUNT OF REFRIGERANT Observe the sight glass on the liquid tube. Item | Symptom | Amount of refrigerant | Remedy 1 | Bubbles present in sight glass | Insufficient* | (1) Check for gas leakage with gas leak tester and repair if necessary (2) Add refrigerant until bubbles dis–appear 2 | No bubbles present in sight glass | None, sufficient or too much | Refer to items 3 and 4 3 | No temperature difference between compressor inlet and outlet | Empty or nearly empty | (1) Check for gas leakage with gas leak tester and repair if necessary (2) Add refrigerant until bubbles disappear 4 | Temperature between compressor inlet and outlet is noticeably different | Correct or too much | Refer to items 5 and 6 5 | Immediately after air conditioning is turned off, refrigerant in sight glass stays clear | Too much | (1) Discharge refrigerant (2) Evacuate air and charge proper amount of purified refrigerant 6 | When air conditioning is turned off, refrigerant foams and then stays clear | Correct | — * Bubbles in the sight glass with ambient temperatures higher than usual can be considered normal if cooling is sufficient. REFRIGERANT CHARGE VOLUME Specified amount: 700 ± 50 g (24.96 ± 1.76 oz.)