Flushing A/C System
- Manufacturer does not recommend flushing A/C system. If system is contaminated, discharge system using approved refrigerant recovery/recycling equipment and install a liquid line filter between condenser and evaporator.
- Filter may be an integral part of the line or line may need to be cut and filter installed (non-integral type). Filters may contain an orifice. See Fig 1
.
- Filters with orifice are used when filter is being installed on low pressure side of the orifice tube. Original orifice tube must be removed if filter with orifice is installed. Filter without the orifice must be installed on the high pressure side of the orifice tube.
- To install liquid line filter, discharge A/C system using approved refrigerant recovery/recycling equipment and remove liquid line. Using a tubing cutter, cut section from liquid line to allow installation of liquid line filter. Clean all burrs and smooth surfaces.
- Install nut over the line. Install ferrule on line with small end toward the nut. DO NOT install "O" ring at this time.
- Push line into fitting until it bottoms on filter assembly. Tighten nuts on each joint to 11 ft. lbs. (15 N.m). Disassemble joint assembly.
- Install new "O" rings, lubricated with refrigeration oil, on the lines. Install filter assembly. Ensure arrow on filter indicates proper flow of refrigerant. Tighten nuts to 11 ft. lbs. (15 N.m). Evacuate system and charge system. Check for leaks.
Courtesy of GENERAL MOTORS CORP.