A/C Compressor, Replacing Without The Need For Flushing Refrigerant Circuit
Cleaning the refrigerant circuit means flushing with refrigerant R1234yf. Refer to REFRIGERANT CIRCUIT, CLEANING .
- Pay attention to the general information for replacing components. Refer to GENERAL INFORMATION FOR REPLACING COMPONENTS .
For Example, in the Event of External Damage Following an Accident
-- Discharge the refrigerant circuit. Refer to REFRIGERANT CIRCUIT, DISCHARGING .
-- Remove the A/C compressor. Refer to A/C Compressor .
Electrically-Driven A/C Compressor
-- Flush the faulty electrically driven A/C compressor to remove the refrigerant oil (write down the quantity of refrigerant oil that was flushed out). Refer to ELECTRICALLY DRIVEN A/C COMPRESSOR, CLEANING .
If more that 75% of the quantity of refrigerant oil is flushed out on a faulty A/C compressor, which corresponds to the amount in the replacement A/C compressor, do not flush the replacement A/C compressor (a small residual amount always remains in the A/C compressor and that the quantity of refrigerant oil in the refrigerant circuit can be disregarded).
If less than 75% of the specified refrigerant oil quantity is flushed out of the defective A/C compressor, the remaining refrigerant oil is found in the refrigerant circuit components. To prevent overfilling with refrigerant oil, flush the refrigerant circuit or the electrically driven A/C compressor.
-- Flush the refrigerant circuit or the new electrically driven A/C compressor to remove the refrigerant oil. Refer to REFRIGERANT CIRCUIT, CLEANING and ELECTRICALLY DRIVEN A/C COMPRESSOR, CLEANING .
-- Dispose of the refrigerant oil removed from the defective and the new A/C compressor/refrigerant circuit (pay attention to local regulations).
The electrically driven A/C compressor is constructed in such a way that it must be flushed in order to remove the refrigerant oil (the refrigerant oil cannot be poured out by removing the draining plug as in the case for the mechanical A/C compressor). Refer to LEAKING OR DAMAGED AREAS, REPLACING, EMPTY REFRIGERANT CIRCUIT EXCEPT A/C COMPRESSOR AND RECEIVER/DRYER .
-- Only fill the replacement A/C compressor with the amount of new refrigerant that corresponds with the amount removed (from the defective A/C compressor).
If, for example, 70 cm 3 of refrigerant oil has been poured out of the defective A/C compressor and 140 cm3 out of the replacement A/C compressor (a small quantity of refrigerant oil remains in the A/C compressor and possibly in the A/C service station). Fill the A/C compressor to be installed, in this case, with 70 cm3 of refrigerant oil (do not use the refrigerant oil that was flushed out of the replacement compressor as it may have become contaminated while in the A/C service station).
Use the different refrigerant oils and quantities for the different A/C compressors. Refer to APPROVED REFRIGERANT OILS AND REFRIGERANT OIL CAPACITIES .
If a greater quantity of refrigerant oil (more than approximately 40 cm3 ) has been flushed out the remaining refrigerant oil can also be added to the evaporator, a refrigerant line or the reservoir/receiver/dryer/inner heat exchanger. Refer to Refrigerant Circuit and APPROVED REFRIGERANT OILS AND REFRIGERANT OIL CAPACITIES .
Mechanically Driven A/C Compressor
-- Remove the oil drain plug from the A/C compressor. Refer to Refrigerant Circuit .
There are different versions of the oil drain plug and its seal (it can be either a seal or a gasket; replace). Refer to LEAKING OR DAMAGED AREAS, REPLACING, EMPTY REFRIGERANT CIRCUIT EXCEPT A/C COMPRESSOR AND RECEIVER/DRYER and to the Parts Information.
-- To accelerate drainage of refrigerant oil, rotate the A/C compressor by way of clutch plate of A/C clutch, for example.
-- Drain the old refrigerant oil from the A/C compressor and dispose (pay attention to local regulations).
-- Remove the oil drain plug from replacement A/C compressor, pour out refrigerant oil and only add a quantity of fresh refrigerant oil equal to the amount poured out of the malfunctioning A/C compressor. Refer to LEAKING OR DAMAGED AREAS, REPLACING, EMPTY REFRIGERANT CIRCUIT EXCEPT A/C COMPRESSOR AND RECEIVER/DRYER .
If, for example, 50 cm3 of refrigerant oil has been poured out of the defective A/C compressor and 100 cm3 out of the replacement A/C compressor (a small quantity of refrigerant oil remains in the A/C compressor). Fill the A/C compressor to be installed with 50 cm3 of refrigerant oil (use can be made of oil poured out of replacement A/C compressor).
Use the different refrigerant oils and quantities for the different A/C compressors. Refer to APPROVED REFRIGERANT OILS AND REFRIGERANT OIL CAPACITIES .
If a greater quantity of refrigerant oil (more than approximately 50 cm3 ) has been poured out the remaining refrigerant oil can also be added to the evaporator or the reservoir/receiver/dryer/inner heat exchanger. Refer to Refrigerant Circuit and APPROVED REFRIGERANT OILS AND REFRIGERANT OIL CAPACITIES .
All
-- Replace the restrictor (only if there is one in this refrigerant circuit).
-- Assemble, evacuate and charge the refrigerant circuit. Refer to WORKING WITH A/C SERVICE STATION .