Sequence of flushing procedure (sequence occurs automatically according to the A/C service station program): Notes

After turning on, the flushing circuit (refrigerant circuit with connecting hoses and refrigerant circuit flushing device) is evacuated first and the refrigerant circuit is checked for leaks at the same time. Depending on the A/C service station version, manually switching to advance the program may be required. Refer to the A/C Service Station Operating Instructions.
A prescribed quantity of refrigerant (such as 5 kg) is added to the evacuated refrigerant circuit via the high pressure side of the A/C service station (in the opposite direction of normal flow when A/C system is in operation and also on the low pressure side of the vehicle refrigerant circuit), or, it is filled with so much refrigerant until the refrigerant circuit and viewing glasses on the refrigerant circuit flushing device are completely filled with fluid refrigerant (depending on version of A/C service station, it detects, for example, that refrigerant no longer flows in over a certain time period).
After the prescribed quantity of refrigerant has been filled, for example, the heater for the refrigerant circuit flushing device is turned on (only if the refrigerant is extracted in its gaseous form from the refrigerant circuit flushing device), depending on version of A/C service station and refrigerant circuit flushing device.
After the refrigerant has been extracted, the heating of the refrigerant circuit flushing device is switched off (if equipped). Depending on the version, the refrigerant circuit may be briefly evacuated again. After evacuation, the refrigerant oil extracted from the refrigerant circuit is separated by the A/C service station.
The sequence of filling refrigerant, extracting (and evacuating) is repeated twice (performed a total of three times). Refer to the A/C Service Station Operating Instructions.
After the third extraction, the flushing circuit is evacuated depending on the version of the A/C service station.

-- After the flushing procedure has ended, check the viewing glass(es) of the refrigerant circuit flushing device. If they are dirty, clean them if necessary according to the operating instructions for the refrigerant circuit flushing device or A/C service station and perform the flushing procedure once more as a test (one cycle is sufficient, duration approximately 30 minutes). Refer to the Operating Instructions for the A/C Service Station.

-- Check the pressure in the refrigerant circuit; there must be no positive pressure in the refrigerant circuit (evacuate briefly once more if necessary).

-- Disconnect the connections to the A/C service station from the vehicle refrigerant circuit (there must be no positive pressure in the refrigerant circuit).

-- Replace these vehicle-specific components (restrictor and reservoir, expansion valve and receiver/dryer or dryer cartridge in the receiver/dryer). Refer to Refrigerant Circuit and the Parts Information.

-- Replace the A/C compressor, depending on the complaint (refer to A/C Compressor and Parts Information), or drain the rest of the refrigerant oil from the removed A/C compressor (refer to REFRIGERANT CIRCUIT COMPONENTS, REPLACING ; replacing refrigerant circuit components) and fill with the specified amount of new refrigerant oil (refer to APPROVED REFRIGERANT OILS AND CAPACITIES ; approved refrigerant oils and capacities).

NOTE:

There is a specific prescribed amount of refrigerant oil in the replacement A/C compressor. If the vehicle has two evaporators, a certain amount of refrigerant oil must also be added to the circuit if necessary. Refer to Refrigerant Circuit and APPROVED REFRIGERANT OILS AND CAPACITIES (Approved Refrigerant Oils and Capacities).

If the A/C compressor is not to be replaced, the quantity of refrigerant oil in the A/C compressor must be topped off according to the prescribed capacity (pour out the refrigerant oil and refill the prescribed quantity into the A/C compressor or refrigerant circuit). Refer to REFRIGERANT CIRCUIT COMPONENTS, REPLACING (replacing refrigerant circuit components) and APPROVED REFRIGERANT OILS AND CAPACITIES (approved refrigerant oils and capacities).

-- Completely reassemble the refrigerant circuit again. Refer to Refrigerant Circuit .

-- Evacuate and fill the refrigerant circuit according to specification. Refer to REFRIGERANT CIRCUIT, EVACUATING WITH A/C SERVICE STATION and REFRIGERANT CIRCUIT, CHARGING WITH A/C SERVICE STATION .

-- Start the A/C system according to specification. Refer to A/C SYSTEM, STARTING AFTER CHARGING REFRIGERANT CIRCUIT and A/C SYSTEM, OPERATING AFTER CHARGING .