Expansion Valve: Service and Repair

64 51 525 Removing And Installing/replacing Expansion Valve (N54)

Special tools required:







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.







IMPORTANT:
Risk of damage.
Restart engine only when A/C system has been correctly filled.
Follow instructions 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:
- Drain off air conditioning system







Lever out expansion rivets (1).
Unclip cable holder (2) on tension struts (3) towards top.







Release screws (1).
Tightening torque 64 53 2AZ.
Detach refrigerant lines (2) in direction of arrow and press slightly to one side.

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







Release screw (1).
Detach adapter plate (2) in direction of arrow.

Installation:
Tightening torque 64 53 3AZ.
Make sure bulkhead grommet (3) is correctly seated in all-round groove of adapter plate (2).







Release screws (1).

Installation:
Tightening torque 64 53 4AZ

Carefully detach bulkhead grommet (2) from bulkhead and fold down in direction of arrow.







Detach expansion valve (1) in direction of arrow.

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

Unclip frame (2) from bulkhead and insert in groove (3) of bulkhead grommet (4).
Make sure bulkhead grommet (4) is correctly seated.







After installation:
- Evacuate and fill A/C system

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