64 52 524 Removing and installing/replacing heating and air conditioning system compressor (N63, with Dynamic Drive)

Special tools required:

WARNING: Danger of injury!
Refrigerant circuit is under high pressure!
Observe SAFETY INFORMATION for handling refrigerant and refrigerant oil.

IMPORTANT: Risk of damage!
Restart engine only when A/C system has been correctly filled.
Read and comply with notes on compressor replacement. See NOTES (AMOUNT OF REFRIGERANT OIL OF NEW COMPRESSOR NOT KNOWN) -or- NOTES (AMOUNT OF REFRIGERANT OIL OF NEW COMPRESSOR KNOWN) .

Follow notes for OPENING AND REPLACING PARTS in refrigerant circuit.

If Air conditioning is opened for more than 24 h:

Replace DESICCANT INSERT FOR HEATING AND AIR CONDITIONING SYSTEM

WARNING: DANGER OF POISONING if oil is ingested/absorbed through the skin!
DANGER OF INJURY if oil comes into contact with eyes and skin!

IMPORTANT: Adhere to the utmost cleanliness. Do not allow any dirt to enter the hydraulic system.
Do not draw off hydraulic fluid (risk of contamination).
Seal off line connections with special tool 32 1 270 .

Recycling:

Catch and dispose of hydraulic fluid in a suitable expansion tank.

IMPORTANT: Pressure line and connections of hydraulic system must be provided with suitable seal plug 32 1 270 immediately after dismantling.

Necessary preliminary work:

DRAW OFF A/C SYSTEM
Remove air conditioning compressor drive belt. See REPLACING A/C COMPRESSOR DRIVE BELT WITH BELT TENSIONER (N63) or REPLACING A/C COMPRESSOR DRIVE BELT WITH BELT TENSIONER (N63O1) .
Remove FRONT RIGHT WHEEL ARCH COVER
Remove STEERING ASSEMBLY COVER
Release UNIVERSAL JOINT WITH CORRUGATED TUBING ON STEERING BOX

Unfasten screws (2).

Tightening torque 64 53 3AZ .

Remove lines (3) from capacitor (1).

Fig 1: Identifying Capacitor, Lines And Screws

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

Fig 2: Protecting Cooling Fins Using Suitable Material

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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 3: Identifying Refrigerant Line, Connecting Piece And Screw

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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 4: Identifying Refrigerant Line And Screw

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IMPORTANT: To avoid the need for axle/wheel alignment, mark position of steering box (1) to front axle support (2).
To do so, draw a wide white stripe on the front bolting points (left and right) and apply a thin black marking (3) to this stripe.

Fig 5: Identifying Steering Gear, Front Axle Support And Black Marking

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Release screw (2).

Tightening torque 37 13 4AZ .

Disconnect line (3).

Release screws (1).

Tightening torque 31 35 1AZ .

Lower active anti-roll bar (4).

Unlock and disconnect plug connection on steering box (6).

Release screws (5).

Tightening torque 32 00 1AZ .

Lower steering box (6).

Fig 6: Identifying Plug Connection On Steering Box, Line And Screw

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Slacken nut (1).

Remove expandable hose (2) from holder (3).

Fig 7: Identifying Steering Box, Screws, Line, And Anti-Roll Bar

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Release screw (3).

Tightening torque 32 41 15AZ .

Disconnect line (2) from line (4).

Slacken nut (1).

Take line (2) off holder.

Fig 8: Identifying Lines, Nut, And Screw

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Release screws (1).

Tightening torque 37 13 8AZ .

Disconnect line (2) from line (3).

Fig 9: Identifying Lines And Screws

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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 10: Identifying Plug Connection, Holder And Screws

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The screw from the previous operation can be reached as shown with a ratchet extension (1) above the front axle support (2).

Fig 11: Identifying Ratchet Extension And Front Axle Support

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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 12: Removing Compressor

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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 53 3AZ .

Fig 13: Identifying Compressor And Refrigerant Line

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Replacement:

Release screw (1).

Tightening torque 64 52 1AZ .

Remove refrigerant line (2).

Adjust the amount of refrigerant oil in the new compressor. See NOTES (AMOUNT OF REFRIGERANT OIL OF NEW COMPRESSOR NOT KNOWN) -or- NOTES (AMOUNT OF REFRIGERANT OIL OF NEW COMPRESSOR KNOWN) .

Fig 14: Identifying Refrigerant Line And Screw

Courtesy 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!
The notes on refrigerant oil must be observed! See NOTES (AMOUNT OF REFRIGERANT OIL OF NEW COMPRESSOR NOT KNOWN) -or- NOTES (AMOUNT OF REFRIGERANT OIL OF NEW COMPRESSOR KNOWN) .

Installation note:

Replace sealing rings.

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

After installation:

EVACUATE AND FILL AIR CONDITIONING
Check line connections for tightness
START-UP with test run of Dynamic Drive