64 52 524 Removing And Installing/Replacing Heating And Air Conditioning System Compressor

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.
Follow safety information for handling R134a refrigerant.
Avoid contact with refrigerant and refrigerant fluid.
Follow safety information for handling refrigerant fluid.







IMPORTANT:
Risk of damage.
Restart engine only when air conditioning system has been correctly filled.
Read and comply with notes on compressor replacement.
Follow instructions for opening and replacing parts in refrigerant circuit.
If air conditioning system is opened for more than 24 hours:
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 plugs 32 1 270 immediately after dismantling.







Necessary preliminary work:
- Drain off air conditioning system
- Remove air conditioning compressor drive belt
- 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).







As shown, protect the cooling fins (1) with suitable material (2) (e.g. aluminium sheet) for the following operations.







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 compressor.







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 eases pivoting the compressor for removal of refrigerant lines.







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.







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).







Slacken nut (1).
Remove expandable hose (2) from holder (3).







Release screw (3).
Tightening torque 32 41 15AZ.
Disconnect line (2) from line (4).
Slacken nut (1).
Take line (2) off holder.







Release screws (1).
Tightening torque 37 13 8AZ.
Disconnect line (2) from line (3).







Unfasten plug connection (1) and disconnect.
Release screw (3) (see next operation).
Unfasten screws (2).
Tightening torque 64 52 3AZ.
Take off holder (4).







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







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 install sealing rings without damaging them.







Feed out compressor (1) downwards as pictured.

Installation note:
Feed in the refrigerant line (2) first, then the compressor (1)
As shown, feed in the refrigerant line (2) upwards via line (3).
Secure the refrigerant line (2) on the compressor.
Tightening torque 64 52 1AZ.
Secure the compressor.
Tightening torque 64 52 3AZ.







Replacement:
Release screw (1).
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.







After installation:
- Evacuate and fill heating and air conditioning system
- Check line connections for tightness
- Start-up with test run of Dynamic Drive

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