Expansion Valve: Service and Repair

64 51 525 Removing And Installing Or Replacing Expansion Valve







Special tools required:
- 00 9 030







WARNING:
Risk of injury.
Refrigerant circuit is under high pressure.
Avoid contact with refrigerant and refrigerant oil.
Read and comply with safety regulations:
- Handling R 134a refrigerant
- Handling refrigerant oil







IMPORTANT:
Risk of damage.
Restart engine only when air conditioning system has been correctly filled.
Follow instructions for opening and replacing parts in refrigerant circuit.
If air conditioning system is opened for more than 24 hours: Replacing drier insert for air conditioning system







Necessary preliminary work:
- Drawing off, evacuating and filling the air conditioning system are not included in the time value given for this work operation
- Remove acoustic insulation from bulkhead upper section







Feed line feed-through (1) toward top.







Release screws (1) and remove refrigerant lines (2) with associated seal.

Tightening torque 64 53 1AZ.

Installation:
Replace sealing rings.

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







F02/F03 Automatic rear air-conditioning system only:

Release screw (1).

Tightening torque 64 53 7AZ.

Remove refrigerant line (2) with associated seal.

Installation:
Replace sealing rings.

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







Unscrew nuts (1).

Tightening torque 64 53 9AZ.

Remove sealing plate (2) by manoeuvring upwards.







Feed out foam material (1).

Unfasten screws (2).

Tightening torque 64 53 2AZ.

Carefully remove flange (3) with expansion valve behind.

Installation:
Replace sealing rings.

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

Flange (3) must be correctly seated on expansion valve.







After installation:
- Evacuate and fill air conditioning system