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

WARNING: This page is about a different car, the 2023 Audi SQ8, 2023 Audi RS Q8, and 2023 Audi Q8. 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).

-- Remove the faulty component *. Refer to Refrigerant Circuit (vehicle-specific service information).

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

Electrically-Driven A/C Compressor

-- 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).

Mechanically Driven A/C Compressor

-- Remove the A/C compressor.* Refer to A/C Compressor (vehicle-specific service information).

-- 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 AUDI OF AMERICA, LLC

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 (depending on the manufacturer of the A/C compressor and the version of the oil drain plug) on "Denso" and "Delphi" A/C compressor is for example installed on the oil drain plug (tightening specification currently 30 Nm on "Denso" and 15 Nm on "Delphi" A/C compressor). On "Sanden" or "Zexel- / Valeo" A/C compressors an oil drain plug or a seal is installed depending on the version on the oil drain plug (tightening specification currently 10 Nm).

On Denso A/C compressors for example a seal -E- is installed on the oil drain plug -D-. For replacement refer to A/C Compressor (vehicle-specific service information) and the Parts Information.

On Sanden A/C compressors for example a seal -C- is installed on the oil drain plug -B-. For the replacement refer to A/C Compressor (vehicle-specific service information) and the Parts Information.

If the seals (seal or O-ring) that are installed on the oil drain plug are not available as a replacement part, the removed seals may be used as an exception (check for damage before installing). If the removed seal is damaged or deformed if necessary replace with a commercially available component.

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 THE NEED FOR FLUSHING REFRIGERANT CIRCUIT (refer to disposal procedure).

All Vehicles

-- Add the entire designated amount of oil to the A/C compressor or the circuit. Refer to A/C COMPRESSOR, REPLACING WITHOUT THE NEED FOR FLUSHING REFRIGERANT CIRCUIT and Technical Data (approved refrigerant oils and capacities for the refrigerant oil can be found in the vehicle-specific service information).

NOTE:

Then fill the A/C compressor with the quantity of new refrigerant oil that equals the quantity of refrigerant oil in the replacement A/C compressor.* Refer to APPROVED REFRIGERANT OILS AND REFRIGERANT OIL CAPACITIES (vehicle-specific service information).

Use the different refrigerant oils and quantities for the different A/C compressors. Refer to APPROVED REFRIGERANT OILS AND REFRIGERANT OIL CAPACITIES (vehicle-specific service information).

To ensure A/C compressor lubrication when starting, 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. Refer to APPROVED REFRIGERANT OILS AND REFRIGERANT OIL CAPACITIES (vehicle-specific service information).

If dirt gets into the A/C compressor when the refrigerant circuit is open (for example, in an accident), then the A/C compressor must be replaced. Refer to A/C Compressor (vehicle-specific service information).

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

-- Replace the dryer cartridge and receiver/dryer.* Refer to Refrigerant Circuit Refrigerant Circuit (vehicle-specific service information).

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