64 52 521 Replacing A/C compressor (N54, N55)

Special tools required:

WARNING: Danger 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 information for HANDLING REFRIGERANT OIL .

IMPORTANT: Risk of damage!
Restart engine only when A/C system has been correctly filled.
Follow instructions on CHANGING THE AIR CONDITIONING COMPRESSOR

Observe the instructions for OPENING AND THE PART EXCHANGE IN THE REFRIGERANT CIRCUIT .

If Air conditioning is opened for more than 24 h:

Replace DESICCANT INSERT FOR A/C SYSTEM .

Necessary preliminary work:

DRAIN OFF AIR CONDITIONING SYSTEM
Remove AIR CONDITIONING COMPRESSOR DRIVE BELT
Remove CHARGE-AIR DUCT

Disconnect plug connection (1).

Release screws (2) and remove refrigerant line.

Tightening torque 64 52 1AZ .

Installation note:

Replace sealing rings.

Use special tool 00 9 030 to mount sealing rings without damaging them.

Fig 1: Identifying Refrigerant Line Plug Connection And Screw

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IMPORTANT: Seal openings or lines on compressor with special tool 32 1 270 to prevent escape of media and fouling.

IMPORTANT: Secure compressor (1) against falling out.

Release screws (2) and remove compressor (2) by pulling upwards.

Tightening torque 64 52 3AZ .

Fig 2: Identifying Compressor Screw

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Replacement

Follow instructions on CHANGING THE AIR CONDITIONING COMPRESSOR

If necessary, release screws (1) and modify holder (2).

IMPORTANT: Danger of compressor damage!
Danger of customer complaints due to reduced cooling power of the Air conditioning!
Before the installation of the new compressor, it is absolutely necessary to adjust the amount of refrigerant oil in the new compressor!
Follow instructions on CHANGING THE AIR CONDITIONING COMPRESSOR

Fig 3: Identifying Compressor Holder

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After installation

EVACUATE AND FILL HEATING AND AIR CONDITIONING SYSTEM .
Assemble engine.