A/C Compressor, Replacing Due To Leaking Or Internal Damage

• This procedure is used, for example, because of noises from the A/C compressor or lack of performance of the A/C compressor.

Procedure 

-- Remove the A/C compressor. Refer to A/C COMPRESSOR, REMOVING AND INSTALLING .

Electric A/C Compressor

-- Drain the refrigerant oil of the faulty A/C compressor into a clean container.

Mechanically Driven A/C Compressor

-- Drain the refrigerant oil of the faulty A/C compressor via the oil drain plug into a clean container. Refer to LEAKING OR DAMAGED COMPONENTS, REPLACING, EMPTY REFRIGERANT CIRCUIT EXCEPT A/C COMPRESSOR AND RECEIVER/DRYER .

Continuation for all vehicles

-- Check the refrigerant oil for discoloration and shavings.

• If no discoloration is determined (dark gray to black discoloration or shavings), then replace the A/C compressor without cleaning the refrigerant circuit. Refer to A/C COMPRESSOR, REPLACING WITHOUT NEEDING TO CLEAN REFRIGERANT CIRCUIT .

-- REFRIGERANT CIRCUIT, CLEANING .

-- Make sure that the quantity of refrigerant oil in the A/C compressor is sufficient, to reach the quantity of refrigerant oil needed in the refrigerant circuit. Especially for vehicles with auxiliary elements (for example a second evaporator) it may be necessary to fill additional refrigerant oil. Refer to REFRIGERANT OIL CAPACITIES .

• If additional refrigerant oil is necessary, then add it when filling the refrigerant oil.

-- Install the A/C compressor. Refer to A/C COMPRESSOR, REMOVING AND INSTALLING .

-- Replace the expansion valve. Refer to EXPANSION VALVE, REMOVING AND INSTALLING .

-- Depending on the vehicle it is necessary to replace other components after replacing the A/C compressor. Refer to A/C COMPRESSOR, REMOVING AND INSTALLING .

-- Charge the refrigerant circuit. Refer to REFRIGERANT CIRCUIT, CHARGING .

-- Start the A/C compressor. For this, perform the "Compressor cut-in, basic setting" function using the Vehicle Diagnostic Tester .