64 52... Notes on changing the air-conditioning compressor, determination of the refrigerant oil level (refrigerant oil level of new air-conditioning compressor not known)

NOTE: This procedure only applies if the new air conditioning compressor does not have a label with the coolant oil level.
A DIFFERENT PROCEDURE applies for air conditioning compressors with a label signaling the coolant oil level.

IMPORTANT: Risk of damage!
Remove the air conditioning compressor without damaging and without the use of force!
Air conditioning compressors with plastic belt pulleys:

Avoid impacts/knocks to plastic belt pulley (caused by tools, contact with base).
Return faulty air conditioning compressors in their original packaging only and with sealed connected branches.

IMPORTANT: In the event of a mechanical air conditioning compressor failure and the resulting ingress of chips into the refrigerant circuit, replace the following parts:

Air conditioning compressor
Air conditioning condenser
Desiccant insert
Line to air conditioning condenser
Refrigerant oil
BMW i, PHEV: all expansion valves

BMW i, PHEV:

Rinse the refrigerant circuit

The new air conditioning compressor is filled at the factory with refrigerant oil.

The coolant oil level in the new air conditioning compressor corresponds to the coolant oil level for the entire new and unfilled refrigerant circuit.

When replacing the air conditioning compressor it is absolutely essential to adapt the coolant oil level in accordance with the instructions below!

An adaptation of the coolant oil level is not required in the following cases:

Replacement of the complete refrigerant circuit.

Evacuate the AIR CONDITIONING SYSTEM .
Record the coolant oil level shown on the A/C service station display.

When evacuating the air conditioning system, refrigerant oil is also extracted and collected in the oil separator of the A/C service station. This refrigerant oil level is displayed after the extraction of the air conditioning on the display of the A/C service station.

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Transfer all of the refrigerant oil remaining in the previous air conditioning compressor into a measuring cup via the oil filler plug.
Turn the belt pulley during the filling process. This allows more refrigerant oil to flow out of the previous air conditioning compressor.

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Read the refrigerant oil level on the measuring cup.

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Open oil filler plug. Tightening torque 64 52 2AZ .
Fill the entire contents of the new air-conditioning compressor into a clean collecting vessel.

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The same amount of refrigerant oil (from the new air-conditioning compressor) as from the previous air-conditioning compressor, + 10 ml as precautionary allowance into a clean measuring cup and fill it again into the new air-conditioning compressor. At least but a total of 50 ml.

Example:

20 ml read at measuring cup:

20 ml + 10 ml precautionary allowance = 30 ml < 50 ml

determined coolant oil level new air conditioning compressor = 50 ml

The drained new refrigerant oil can be filled into the expansion tank of the A/C service station after draining.

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If the new, drained refrigerant oil is not filled straight away into the expansion tank of the A/C service station, it must be disposed of properly.

On account of its hygroscopic properties, refrigerant oil must not be stored in open collecting vessels.

Reassemble the vehicle.
EVACUATING THE AIR CONDITIONING .
Before filling the air conditioning with refrigerant, fill the noted amount of the previously suctioned off refrigerant oil into the system.
FILL A/C SYSTEM .

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IMPORTANT: Risk of damage!
It is essential to carry out the following running-in procedure when putting a new air-conditioning compressor into initial operation.
Do not exceed the idle speed.

NOTE: The running-in procedure for the new air conditioning compressor can either be carried out manually or using the diagnostic system.

Manual:

Switch off the air conditioning.
Put all ventilation outlets in the dashboard to "OPEN".
Start the engine and let it stabilize at idle speed.
Set the blower output to a minimum of 75% of the maximum blower output.
Switch on the air conditioning and allow the engine to run at idle speed for a minimum of 2 minutes .

Perform the following service function with the diagnostic system:

Body
Heating and air conditioning functions
Run-in protection for A/C compressor
The refrigerant oil drawn off from the oil separator of the A/C service station and from the previous air conditioning compressor must not be reused and must be correctly disposed of.
Observe country-specific waste disposal regulations.

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Installation note:

If the refrigerant circuit is open for longer than 24 hours:

Replace desiccant insert