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Home >> Buick >> 1992 >> Roadmaster Base >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> General Servicing >> A/C System General Servicing >> Refrigerant Recovery
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Refrigerant Recovery

CAUTION: If variation is noted in service procedures, follow the manufacturer's instructions on refrigerant recovery/recycle system.
  1. Close both valves on manifold gauge set. Connect manifold gauge set to high and low side service valves. See SERVICE VALVE LOCATIONS in this article.
  2. Connect center hose on manifold gauge set to inlet port on Refrigerant Recovery/Recycle System (J-38100-B). Start engine. Turn A/C on for approximately 2 minutes.
    NOTE: Operating A/C for 2 minutes will warm the refrigerant so refrigerant recovery/recycle system can recover more refrigerant from the system.
  3. Shut engine off. Open BOTH valves on manifold gauge set. Open BOTH valves on refrigerant recovery/recycle system storage tank at the same time.
  4. Plug refrigerant recovery/recycle system in and turn power switch on. Depress compressor START switch and note that the compressor ON light is activated.
  5. The refrigerant recovery/recycle system will shut off when a vacuum reading of 17 in. Hg is obtained on manifold gauge set. Manifold gauge vacuum reading should remain at 17 in. Hg for at least 2 minutes.
  6. If reading increases to above zero, refrigerant still remains in the vehicle A/C system. Depress compressor START switch and operate refrigerant recovery/recycle system through another cycle.
  7. Once refrigerant is recovered, open accumulator pressure valve on the refrigerant recovery/recycle system for 15 seconds. This will pressurize the oil separator so refrigerant oil can be drained.
  8. Open OIL DRAIN valve on the refrigerant recovery/recycle system and drain refrigerant oil into a container. Measure exact amount of oil to be added when system is put back in service.