Leaking Or Damaged Components, Replacing, Empty Refrigerant Circuit Except A/C Compressor And Receiver/Dryer

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.

The refrigerant circuit was completely empty (for example with larger leak or cracked hose line)

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

NOTE:

In the event of only a minor leak with slow escape of refrigerant (for example at a small leakage point), the amount of refrigerant oil lost and the amount of moisture penetrating after servicing is not sufficient to influence the A/C system function.

The operations marked * are only to be implemented in case of a major leak (for example after a collision).

Electrically-Driven A/C Compressor

-- Remove the faulty component. Refer to SYSTEM OVERVIEW - REFRIGERANT CIRCUIT, R1234YF .

-- Remove the electrically-driven A/C compressor and clean (flush with refrigerant R1234yf)*. Refer to REFRIGERANT CIRCUIT, CLEANING and A/C COMPRESSOR (vehicle-specific Service Information).

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

-- Add the entire designated amount of oil to the A/C compressor or the circuit. Refer to A/C COMPRESSOR, REPLACING WITHOUT NEEDING TO CLEAN REFRIGERANT CIRCUIT and Technical Data (approved refrigerant oils and capacities for the refrigerant oil can be found in the vehicle-specific Service Information).

Mechanically Driven A/C Compressor

-- Remove the faulty component. Refer to SYSTEM OVERVIEW - REFRIGERANT CIRCUIT, R1234YF .

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

-- Remove the oil drain plug -B / D- from the A/C compressor -A-.*

Fig 1: Identifying Removal Of Oil Drain Plug -B- / -D- From A/C Compressor -A-

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

NOTE:

The versions of the oil drain plug -B / D- and the seal -C / E- are different (depending on the manufacturer of the A/C compressor). Refer to A/C Compressor (vehicle-specific Service Information).

When installing the oil drain plug -B / D-, note the tightening specification (dependent on the A/C compressor manufacturer and the oil drain plug version). For Denso and Delphi A/C compressors, a seal is installed on the oil drain plug, for example. Refer to OVERVIEW - A/C COMPRESSOR .

After charging the refrigerant circuit check the installed oil drain plug for leaks for example using an electronic leak detector.

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

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

All Vehicles

NOTE:

Then fill A/C compressor with quantity of new refrigerant oil corresponding to quantity of refrigerant oil in replacement A/C compressor.* Refer to REFRIGERANT OIL CAPACITIES, R1234YF .

Use different refrigerant oils and quantities for different A/C compressors. Refer to REFRIGERANT OIL CAPACITIES, R1234YF .

To ensure the A/C compressor is lubricated at start-up, at least 40 cm³ of refrigerant oil must be poured into the A/C compressor. The remainder can be added to the new reservoir/receiver/dryer or a refrigerant line, for example. Refer to REFRIGERANT OIL CAPACITIES, R1234YF .

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

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

-- Replace the dryer cartridge and receiver/dryer. Refer to SYSTEM OVERVIEW - REFRIGERANT CIRCUIT, R1234YF .

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