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64 52 523 Removing and installing/replacing A/C system compressor (N63, X Drive)

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Special tools required: 

WARNING: Danger of injury! 
Refrigerant circuit is under high pressure!
Avoid contact with refrigerant and refrigerant oil.
Read and comply with safety instructions:
IMPORTANT: Risk of damage!

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

READ AND COMPLY WITH NOTES ON COMPRESSOR REPLACEMENT .

FOLLOW NOTES FOR OPENING AND REPLACING PARTS IN REFRIGERANT CIRCUIT

If Air conditioning is opened for more than 24 h:

Replace desiccant insert for A/C system.  . See 64 53 517 REPLACING DESICCANT INSERT FOR AIR CONDITIONING SYSTEM  or 64 53 518 REPLACING DESICCANT INSERT FOR A/C SYSTEM (CAPACITOR REMOVED) .

Necessary preliminary work 

Protect cooling fins (1) as shown with suitable material (2) (e.g. aluminum sheet) for the following work operations.

Fig 1: Protecting Cooling Fins Using Suitable Material
G08510102Courtesy of BMW OF NORTH AMERICA, INC.

Release screw (2).

Tightening torque 64 53 7AZ .

Take the refrigerant line (1) off the connecting piece (3).

NOTE: Refrigerant line (1) is fed out together with the air conditioning compressor.
Fig 2: Identifying Refrigerant Line With Air Conditioning Compressor
G09881659Courtesy of BMW OF NORTH AMERICA, INC.

Release screw (1).

Tightening torque 64 53 3AZ .

Take the refrigerant line (2) of the condenser.

NOTE: Position refrigerant line (2) in direction of arrow.

This work step makes swivelling the compressor to remove the refrigerant lines easier.

Fig 3: Removing Refrigerant Lines
G08510104Courtesy of BMW OF NORTH AMERICA, INC.

Unfasten plug connection (1) and disconnect.

Release screw (3) (see next operation).

Unfasten screws (2).

Tightening torque 64 52 3AZ .

Take off holder (4).

Fig 4: Identifying Plug Connection, Holder And Screws
G08510105Courtesy of BMW OF NORTH AMERICA, INC.
IMPORTANT: Seal openings or lines on compressor with special tool 32 1 270 to prevent escape of media and dirt contamination.

Secure compressor (1) against falling out.

Take compressor (1) off the crankcase and turn downwards slightly.

Release screw in the marked area at refrigerant line (2).

Tightening torque 64 52 1AZ .

Remove refrigerant line (2).

Installation note: 

Replace sealing rings.

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

Fig 5: Removing Sealing Rings
G08510106Courtesy of BMW OF NORTH AMERICA, INC.

Feed out compressor (1) downwards as pictured.

Installation note: 

First  feed in the refrigerant line (2) then  the compressor (1).

Feed in refrigerant line (2) as shown via line (3) to the top.

Secure refrigerant line (2) on compressor.

Tightening torque 64 52 1AZ .

Secure compressor.

Tightening torque 64 52 3AZ .

Fig 6: Identifying Compressor And Refrigerant Line
G08510107Courtesy of BMW OF NORTH AMERICA, INC.

Replacement 

Release screw (1).

Tightening torque 64 52 1AZ .

Remove refrigerant line (2).

Adjust amount of refrigerant oil in the new compressor.  . See 64 52... NOTES FOR CHANGING THE AIR CONDITIONING COMPRESSOR (AMOUNT OF REFRIGERANT OIL OF NEW AIR CONDITIONING COMPRESSOR NOT KNOWN)  or 64 52... NOTES FOR CHANGING THE AIR CONDITIONING COMPRESSOR (AMOUNT OF REFRIGERANT OIL OF NEW AIR CONDITIONING COMPRESSOR KNOWN) .

Fig 7: Identifying Refrigerant Line And Screw
G08510108Courtesy of BMW OF NORTH AMERICA, INC.
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!
Read and comply with safety information without fail  . See 64 52... NOTES FOR CHANGING THE AIR CONDITIONING COMPRESSOR (AMOUNT OF REFRIGERANT OIL OF NEW AIR CONDITIONING COMPRESSOR NOT KNOWN)  or 64 52... NOTES FOR CHANGING THE AIR CONDITIONING COMPRESSOR (AMOUNT OF REFRIGERANT OIL OF NEW AIR CONDITIONING COMPRESSOR KNOWN) .

Installation note: 

Replace sealing rings.

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

After installation: 

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