Replacing A/C System Compressor (N52)

64 52 523 - Replacing A/C system compressor (N52)





Special tools required:
- 32 1 270 32 1 270 Plugs (Set)





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 Instructions for Handling Refrigerant Oil (for Refrigerant R 134a).





Important!
Aluminium-magnesium materials.

No steel screws/bolts may be used due to the threat of electrochemical corrosion.

A magnesium crankcase requires aluminium screws/bolts exclusively.

Aluminium screws/bolts must be replaced each time they are released.

The end faces of aluminium screws/bolts are painted blue for the purposes of reliable identification.

Jointing torque and angle of rotation must be observed without fail (risk of damage)!





Important!
Risk of damage!

Restart engine only when A/C system has been correctly filled.

Read and comply with notes on replacing compressor. Instructions for Compressor Replacement

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 for A/C system





Necessary preliminary tasks:
- Drawing off, evacuating and filling the A/C system Drawing off, Evacuating and Filling A/C System (R 134a) are not included in the time value given for this work operation
- Remove alternator drive belt Service and Repair
- Remove front underbody protection Removing and Installing / Replacing Front Underbody Protection
- Remove coolant thermostat Service and Repair





Disconnect plug connection (1).

Release screws (2, 3) and disconnect pressure and suction lines.

Installation Note:
Replace all sealing rings and moisten with refrigerant oil.

Tightening torque 64 52 1AZ Specifications.





Important!
Seal openings or lines on compressor with special tool 32 1 270 32 1 270 Plugs (Set) to prevent escape of media and fouling.





Note:
Secure compressor (3) against falling out.

Release bolt (2) and if necessary remove with bushing behind.

Release bolts (1) and remove compressor (3) towards front.

Installation Note:
Make sure bushings are correctly fitted.

If necessary, replace faulty bushings.

Tightening torque 64 52 3AZ Specifications.





After installation:

- Evacuate and fill A/C system Drawing off, Evacuating and Filling A/C System (R 134a)
- Fill and vent cooling system and check for leaks