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1991 GENERAL SERVICING A/C Compressor Refrigerant Oil Checking ISOLATING COMPRESSOR 1. Connect service gauge set to the compressor service valves and open compressor valves slightly (turn in clockwise). Start engine and operate air conditioning. Slowly turn compressor suction valve clockwise toward closed (front-seated) position. 2. When suction pressure is reduced to zero or less, turn off engine and compressor and quickly turn suction valve stem in to full front- seated position. Suction pressure should be slightly above zero. Turn discharge valve into front-seated position. 3. To check oil level, slowly open compressor crankcase plug to relieve any remaining pressure. After oil level is corrected, cap service gauge ports on both valves. Back-seat suction service valve to allow refrigerant to enter compressor. Open discharge valve halfway. 4. Loosen discharge service valve cap, allowing refrigerant pressure to force air out of compressor. Back-seat service valve and tighten cap. Compressor is now ready for operation. REFRIGERANT OIL Only new, pure, moisture-free refrigerant oil should be used in the air conditioning system. This oil is highly refined and dehydrated to a point SERVICING PRECAUTIONS DISCHARGING SYSTEM PRECAUTIONS If compressor has stem-type service valves, it can be isolated and removed without discharging entire system. See ISOLATING DISCONNECTING LINES & FITTINGS TEST After system is discharged, carefully clean area around all fittings to be opened. Always use 2 wrenches when tightening or loosening fittings CONNECTING LINES AND FITTINGS A new gasket or "O" ring should be used in all instances when connecting lines or fittings. Dip "O" ring in new refrigerant oil and ensure it is PLACING SYSTEM IN OPERATION After component service or replacement has been completed and all connections have been made, evacuate system thoroughly with a vacuum ATSUGI ROTARY VANE DRAIN & REFILL 1. Before checking and adjusting oil level, operate compressor at engine idling speed, with controls set for maximum cooling and high blower speed, for 20 to 30 minutes to return oil to compressor. 2. Stop engine, discharge refrigerant and remove compressor from vehicle. See SERVICING PRECAUTIONS at beginning of article. Drain compressor oil from compressor discharge port and measure the amount. Oil is sometimes hard to drain when compressor is cool. 3. If the amount drained is less than 3 ounces, conduct leak tests at system connections, and if necessary, repair or replace faulty parts. Check purity of oil and adjust oil level as follows. 4. If amount drained was above 3 ounces, oil level is right. Pour in same amount as was drained. If amount drained was below 3 ounces, pour in 3 ounces of new refrigerant oil. BOSCH 6-CYL DRAIN & REFILL 1. Before checking and adjusting oil level, operate compressor at engine idling speed, with controls set for maximum cooling and high blower speed, for 20 to 30 minutes to return oil to compressor. 2. Stop engine and discharge refrigerant. Remove refrigerant oil level inspection plug on side of compressor. Oil should be at lower lip of threaded hole. Add necessary new refrigerant oil (if low). Replace inspection plug and tighten to 10-12 ft. lbs. (14-16 N.m). NOTE: Only compressors with stem-type service valves can be isolated. NOTE: Recent findings by the EPA indicate that refrigerant is harmful to the earth's protective Ozone layer. NOTE: Air conditioning systems will not normally need addition of refrigerant oil unless definite oil loss has |