Automotive A/C Refrigerant Flushing

Paper #:
  • 2017-01-0167

Published:
  • 2017-03-28
Abstract:
Purpose: Determine the effectiveness of flushing a contaminated automotive A/C system with a refrigerant recovery and recharge machine, using refrigerant as a flushing agent. The current flushing method uses solvent flushing. Methodology: Introduce contamination into the vehicle A/C system to induce a compressor failure. Run the vehicle A/C system at various speeds and engine RPM’s until the compressor fails. Certified Arizona Dust is the contaminant chosen for this study. Flush contaminated components using various manufactures A/C recovery and recharge machines using refrigerant as a flush agent. Flush components at different time intervals of 15, 30, 40 and 60 minutes for each machine being tested. Machines that were used for this test had continuous loop flushing capability. The current solvent flush time is 15 minutes flushing and 30 minutes purge for a total time of 45 minutes. Flushed components are evaluated to determine the amount of contamination removal. The test lab injects epoxy into component inlet until epoxy is pushed out the outlet fitting into a cup. The epoxy that exits the outlet port is examined for the amount if any of loose contamination. Once filled the component sets for a period of time allowing the epoxy to harden. The component is then cut and sectioned to reveal inner geometry of the component. The end tanks and tubes are sectioned to reveal the remaining level of contamination.
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