64 52 521 Replacing A/C Compressor

64 52 521 - Replacing A/C system compressor (S65)





Warning!
Scalding hazard!
Work on the cooling system may only be carried out when it has cooled down.





Warning!
Risk of injury!
Refrigerant circuit is under high pressure!
Follow safety instructions for handling R 134a refrigerant.
Avoid contact with refrigerant and refrigerant oil.
Follow safety instructions for handling refrigerant oil [1][2]64 50 ... Safety Instructions for Handling Refrigerant Oil.





Important!
Risk of damage!
Restart engine only when A/C system has been correctly filled.
Read and comply with notes 64 52 ... Instructions For Compressor Replacement on replacing compressor.
Follow instructions Removal and Replacement for opening and replacing parts in refrigerant circuit.
If A/C system is opened for more than 24 hours:
Replace desiccant insert Service and Repair for A/C system.





Necessary preliminary tasks:
- Drawing off 64 50 009 Drawing Off, Evacuating and Filling A/C System (R 134a), evacuating and filling the A/C system is not included in the time value given for this work operation
- Remove A/C compressor drive belt Service and Repair
- Drain coolant Service and Repair from radiator
- Remove coolant hose from radiator at bottom





Disconnect overflow hoses (1) and lay to one side.
Release screws (2).
Raise coolant tank (3) and disconnect associated plug connection.
Place coolant tank (3) to one side.





Disconnect plug connection (1).
Release screws (2) and remove refrigerant lines.

Installation Note:
Tightening torque 64 52 1AZ .
Replace all sealing rings and moisten with refrigerant oil.





Release screws (1, 2) and remove bracket (3).

Important!
Secure compressor (5) against falling off/down.

Release screw (4) and feed out compressor (5) towards top.





Installation Note:
If necessary, replace damaged adapter sleeves (1).





After installation:
- Fill and vent cooling system
- Evacuate and fill A/C system 64 50 009 Drawing Off, Evacuating and Filling A/C System (R 134a)