A/C Compressor, Replacing Without The Need For Flushing Refrigerant Circuit

Cleaning the refrigerant circuit means flushing with refrigerant R134a. Refer to Refer to REFRIGERANT CIRCUIT, CLEANING (FLUSHING) WITH REFRIGERANT R134A .

If a faulty A/C compressor is replaced with an A/C compressor from another manufacturer, check if the same refrigerant oil is approved for the A/C compressor to be installed as the one that is already in the refrigerant circuit (from the removed A/C compressor). If a different refrigerant oil is approved for the A/C compressor to be installed than the one in the removed A/C compressor, the refrigerant circuit must be flushed. Refer to Refer to APPROVED REFRIGERANT OILS .

Use different refrigerant oils and quantities for the various compressors. Refer to Refer to REFRIGERANT OIL CAPACITIES .

Electrically driven A/C compressors cannot have the refrigerant oil poured out in the same manner as a mechanically driven A/C compressor. There is no drain plug, the A/C compression cannot be turned and because it is installed inside defending on the version only a specialized part or no refrigerant oil can be poured out. (Due to the different distribution of refrigerant oil in the A/C compressor). Usually a residual amount between 30 and 80 cm³ remains in the A/C compressor when pouring out. For this reason, the removed A/C compressor is to be flushed to remove the refrigerant oil and to determine the amount of refrigerant oil, depending on the complaint. Refer to Refer to ELECTRICALLY-DRIVEN A/C COMPRESSOR, FLUSHING (REMOVING REFRIGERANT OIL) .

If the recommended amount of refrigerant oil cannot be poured out of the A/C compressor to be installed if necessary the new A/C compressor to be installed may be flushed. In the new A/C compressor as much refrigerant oil the amount is to be filled as was flushed out of the old A/C compressor. Refer to Refer to ELECTRICALLY-DRIVEN A/C COMPRESSOR, FLUSHING (REMOVING REFRIGERANT OIL) .

At room temperature the refrigerant oil had approximately the same density as water (1 kg (2.2 lbs) equals a liter).

Also electrical A/C compressors of the same version (same manufacturer, same part number) mostly do not have the same weight so that the amount of refrigerant oil contained cannot be determined by weighing (the tolerances are too large, to determine the amount of refrigerant oil contained via the weight).

Depending on the construction and the storage of the A/C compressor the refrigerant oil separated unevenly in the A/C compressor. One part can be located in the compression chamber and another in the area of the electronic motor, so that here the refrigerant oil must be alternately poured out via both connections for the refrigerant lines (high and low pressure side). While doing this arrange the A/C compressor so that the relevant connection is as far downward as possible.

Dispose of the refrigerant oil removed from the defective and the new A/C compressor and poured out refrigerant oil from the new A/C compressor which is no longer necessary. Refer to Audi ServiceNet, HSO Environment (pay attention to local regulations).

There are different versions of the oil drain plug and its seal (it can be either an O-ring or a gasket; always replace). Refer to Refer to LEAKING OR DAMAGED COMPONENTS EXCEPT A/C COMPRESSOR, RESERVOIR OR RECEIVER/DRYER  and to the Parts Information.