A/C Refrigerant System, Replacing Components

A/C Refrigerant System, Replacing Components
Before carrying out any work on the A/C refrigerant system, refer to all CAUTIONS and WARNINGS in A/C refrigerant system safety measures.

Replacement A/C compressors, evaporators and condensers supplied by the Parts Department are filled with Nitrogen. If gas (Nitrogen) does not escape when the component is first opened, the component may be faulty (leaking) and must not be installed.

Replacement A/C compressors are filled with the total refrigerant oil quantity needed for the entire refrigerant system.

Always replace the drier cartridge whenever the refrigerant system has been left open. Install immediately after opening to prevent moisture contamination of drier desiccant. Moreover, keep refrigerant system and other replacement components sealed for as long as possible to minimize the chance of dirt and moisture contamination.

Always plug open refrigerant line connections to prevent dirt and moisture contamination.

If the system has been discharged because of a damaged or leaking component (refrigerant hose/line, compressor, evaporator, condenser, etc.), flush the refrigerant system first with compressed air, then with Nitrogen (available locally) and collect the oil that runs out. This will remove the refrigerant oil which may be
saturated with moisture.

CAUTION: DO NOT flush R-134a refrigerant system with R-11. R-11 is not compatible with refrigerant R134a and PAG oil and will cause total system contamination.

If the compressor is not replaced after flushing the system, fill compressor with the correct type and quantity of refrigerant oil specified under A/C system capacities. fill compressor with the total system oil capacity.

Also take into account whether or not vehicle is equipped with the Four-zone CLimatronic system. Extra refrigerant oil must be added accordingly.

If the compressor is replaced, do not add additional oil as the total amount of oil required is already in the compressor.

Dispose of contaminated refrigerant oil following laws governing hazardous waste disposal. Do not combine any refrigerant oil with any other old oils such as engine oil or transmission fluid.