Compressor, Replacing Without The Need For Flushing Refrigerant Circuit

WARNING: This page is about a different car, the 2022 Audi S3, 2022 Audi RS 3, 2022 Audi A3 Quattro, and 2022 Audi A3. However, it is still accessible from the selected car via links, so may be relevant.

For example, because of noise or no A/C compressor output

NOTE:

If there is damage on the A/C compressor electronics, for example on the A/C Compressor Regulator Valve -N280- on a mechanical A/C compressor or on the A/C Compressor Control Module -J842- of the electrical A/C compressor, then the refrigerant circuit does not have to always be cleaned. Here it is usually acceptable to replace the A/C compressor without cleaning the refrigerant circuit (adapt the amount of refrigerant oil). Refer to COMPRESSOR, REPLACING WITHOUT THE NEED FOR FLUSHING REFRIGERANT CIRCUIT .

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 APPROVED REFRIGERANT OILS .

-- Discharge the refrigerant circuit.

-- Remove the A/C compressor. Refer to A/C Compressor (vehicle-specific Service Information).

-- Clean the refrigerant circuit (flush with refrigerant R134a). Refer to REFRIGERANT CIRCUIT, CLEANING (FLUSHING) WITH REFRIGERANT R134A .

NOTE:

For internal damage (to the A/C compressor) check the refrigerant hoses and condenser for example shavings have penetrated clean refrigerant hoses and condenser (flush with refrigerant R134a, (Refer to REFRIGERANT CIRCUIT, CLEANING (FLUSHING) WITH REFRIGERANT R134A .) and if necessary replace the refrigerant hoses.

In vehicles with two evaporators, the refrigerant oil quantity in the refrigerant circuit may be greater than the quantity which is found in the replacement compressor; if necessary, add the remaining refrigerant oil quantity to the refrigerant circuit. Refer to REFRIGERANT CIRCUIT, FLUSHING WITH COMPRESSED AIR AND NITROGEN .

-- Replace the dryer cartridge, receiver/dryer or reservoir and restrictor. Refer to Refrigerant Circuit (vehicle-specific Service Information).

-- Check the expansion valve for dirt or corrosion; replace if necessary. Refer to Refrigerant Circuit (vehicle-specific Service Information).

-- Assemble, evacuate and charge the refrigerant circuit.