64 52... Notes on replacing air conditioning compressor, determining the amount of refrigerant oil (amount of refrigerant oil for new air conditioning compressor not known)
A DIFFERENT PROCEDURE applies for air conditioning compressors without a label containing the coolant oil level.
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.
- 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
All vehicles without I01 with heat pump:
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.
Only I01 with heat pump:
The new air conditioning compressor and new dryer flask are filled at the factory with refrigerant oil.
The coolant oil level in the new air conditioning compressor and in the new dryer flask 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!
BMW I01 with heat pump: An adaptation is also required for the replacement of the dryer flask.
An adaptation of the coolant oil level is not required in the following cases:
- Replacement of the complete refrigerant circuit.
- If the refrigerant circuit was rinsed (only BMW i, PHEV).
Step 1:
Determination of the refrigerant oil level extracted from the 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.
The refrigerant oil amount specification is located on the label on the air conditioning compressor.
The position of the label can vary depending on the air conditioning compressor.
Refrigerant oil level details given on the label in g, ml or cc.
Ml are specified throughout these repair instructions for adjusting the coolant oil level, as g or cc closely correspond to ml.
Step 2:
Compare refrigerant oil level details on the previous and new air conditioning compressor:
- Read and note the coolant oil level specification from the previous air-conditioning compressor.
(If no label available, proceed with step 3, case 1. )
- Read and note the coolant oil level specification from the new air-conditioning compressor.
- Compare refrigerant oil levels together.
Different cases:
- Refrigerant oil level details on the previous and new air conditioning compressor are the same . In this case proceed with step 3, case 1 .
- Refrigerant oil level details on the previous and new air conditioning compressor are not the same
:
Different cases:
- Refrigerant oil level details on the previous air conditioning compressor are higher
than the refrigerant oil details on the new air conditioning compressor:
Difference is not taken into consideration. In this case proceed with step 3, case 1 .
- Refrigerant oil level details on the previous air conditioning compressor are lower
than the refrigerant oil details on the new air conditioning compressor:
Take the difference of both amounts of coolant oil and note. Then proceed with step 3, case 2.
- Refrigerant oil level details on the previous air conditioning compressor are higher
than the refrigerant oil details on the new air conditioning compressor:
Example:
Refrigerant oil level details previous air conditioning compressor 110 g
Refrigerant oil level details new air conditioning compressor 150 g
150 g - 110 g = 40 g correspond to roughly 40 ml
Note difference 40 ml.
Step 3:
Detection of refrigerant oil level in new air conditioning compressor:
- 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.
- Read the refrigerant oil level on the measuring cup.
Different cases:
Case 1:
- Add 10 ml precautionary allowance to the amount of refrigerant oil read.
- Note 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
Case 2:
- Add 10 ml precautionary allowance to the amount of refrigerant oil read.
- Add the difference to this.
- Note at least but a total of 50 ml.
Example:
Difference = 40 ml
20 ml read at measuring cup:
20 ml + 10 ml precautionary allowance = 30 ml 50 ml
30 ml + 40 ml difference = 70 ml > 50 ml
refrigerant oil level detected in the new air conditioning compressor = 70 ml
Step 4:
Determination of refrigerant oil level drained off from the new air conditioning compressor:
- Open oil filler plug. Tightening torque 64 52 2AZ .
- Drain the following coolant oil level from the new air conditioning compressor into a clean measuring cup:
Refrigerant oil level to be drained from the new air conditioning compressor = refrigerant oil level on the label for the new air conditioning compressor - refrigerant oil level detected in the new air conditioning compressor
Example:
refrigerant oil level stated on the label of the new air conditioning compressor: 150 ml
Refrigerant oil level detected in the new air conditioning compressor: 50 ml
refrigerant oil level to be drained = 150 ml - 50 ml = 100 ml
100 ml must be drained from the new air conditioning compressor.
The drained new refrigerant oil can be filled into the expansion tank of the A/C service station after draining.
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.
Step 5
Fill refrigerant circuit with the correct amount of refrigerant and refrigerant oil:
- Reassemble the vehicle.
- Evacuate the AIR CONDITIONING SYSTEM .
- Before filling the air conditioning with refrigerant oil, refill the system with the same amount of previously extracted refrigerant oil noted in step 1.
- Fill the A/C SYSTEM .
Step 6
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.
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
Step 7
Dispose of extracted refrigerant oil:
- 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.
Installation note:
If the refrigerant circuit is open for longer than 24 hours:
- Replace desiccant insert