Dryer Cartridge / Receiver/Dryer, Replacing After Cleaning Refrigerant Circuit

WARNING: This page is about a different car, the 2022 Volkswagen ID.4 and 2021 Volkswagen ID.4. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Usually there is a dryer cartridge or a desiccant bag installed in the receiver/dryer (depending on the design of the refrigerant circuit). Refer to SYSTEM OVERVIEW - REFRIGERANT CIRCUIT, R1234YF .

Pay attention to the general information for replacing components. Refer to GENERAL INFORMATION FOR REPLACING COMPONENTS .

NOTE:

Cleaning the refrigerant circuit means flushing with refrigerant R1234yf. Refer to REFRIGERANT CIRCUIT, CLEANING .

For example, on account of ingress of moisture (refrigerant circuit open for lengthy period) or contamination

-- Discharge the refrigerant circuit. Refer to WORKING WITH A/C SERVICE STATION .

-- Remove the A/C compressor. Refer to A/C Compressor .

-- Eliminate the cause of the malfunction. Refer to SYSTEM OVERVIEW - REFRIGERANT CIRCUIT, R1234YF .

-- Clean the refrigerant circuit (flush with refrigerant R1234yf). Refer to REFRIGERANT CIRCUIT, CLEANING .

Electrically-Driven A/C Compressor

-- Flush the old refrigerant oil out of A/C compressor. Refer to ELECTRICALLY-DRIVEN A/C COMPRESSOR, CLEANING .

Mechanically Driven A/C Compressor

-- Remove the oil drain plug from the A/C compressor. Refer to A/C Compressor .

NOTE:

Replacing the different versions of the oil drain plugs and their corresponding seal. Refer to LEAKING OR DAMAGED COMPONENTS, REPLACING, EMPTY REFRIGERANT CIRCUIT EXCEPT A/C COMPRESSOR AND RECEIVER/DRYER and SYSTEM OVERVIEW - REFRIGERANT CIRCUIT, R1234YF (vehicle-specific Service Information) and the Parts Information.

-- To accelerate drainage of refrigerant oil, turn the A/C compressor via the belt pulley or the A/C clutch plate, for example. Refer to A/C Compressor .

-- Pour old refrigerant oil out of the A/C compressor. Refer to A/C COMPRESSOR, REPLACING WITHOUT NEEDING TO CLEAN REFRIGERANT CIRCUIT .

NOTE:

Dispose of old refrigerant oil (pay attention to local regulations).

All A/C Compressors

-- Check the expansion valve for dirt or corrosion; replace if necessary. Refer to SYSTEM OVERVIEW - REFRIGERANT CIRCUIT, R1234YF .

-- Then add to the A/C compressor the new refrigerant oil quantity which matches the refrigerant oil quantity in the replacement compressor (or the specified refrigerant oil quantity in vehicles with two evaporators). Refer to REFRIGERANT OIL CAPACITIES, R1234YF .

NOTE:

Use different refrigerant oils and quantities for different A/C compressors. Refer to Technical Data (vehicle-specific Service Information).

To ensure A/C compressor lubrication at start-up, at least 40 cm³ of refrigerant oil must be poured into the A/C compressor. The remainder can be added to a refrigerant line or the new reservoir/receiver/dryer/inner heat exchanger, for example. Refer to GENERAL INFORMATION FOR REPLACING COMPONENTS and Technical Data .

If on an open refrigerant circuit dirt enters the A/C compressor (for example during an accident) the refrigerant circuit must be cleaned and the A/C compressor must be replaced. Refer to REFRIGERANT CIRCUIT, CLEANING and A/C Compressor .

On vehicles with two evaporators, the amount of refrigerant oil in the refrigerant circuit may be greater than the amount that is in the replacement A/C compressor. If necessary, add the remaining amount of refrigerant oil to the refrigerant circuit. Refer to Technical Data (vehicle-specific Service Information).

-- Replace the desiccant bag/dryer cartridge (receiver/dryer). Refer to SYSTEM OVERVIEW - REFRIGERANT CIRCUIT, R1234YF .

-- Assemble, evacuate and fill the refrigerant circuit. Refer to WORKING WITH A/C SERVICE STATION .