Expansion Valve: Service and Repair

64 51 525 - Removing and installing or replacing expansion valve





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 [1][2]Safety Instructions for Handling Refrigerant Oil.





Important!
Risk of damage!
Restart engine only when A/C system has been correctly filled.
Read and comply with notes on replacing compressor.
Follow instructions Removal and Replacement for opening and replacing parts in refrigerant circuit.
If A/C system is opened for more than 24 hours:
Replacing drier insert for A/C system





Necessary preliminary tasks:
- Drawing off, evacuating and filling the A/C system Drawing off, Evacuating and Filling A/C System (R 134a) are not included in the time value given for this work operation
- Remove fresh air duct Service and Repair





Feed out rubber grommet (1).

Installation Note:
Make sure rubber grommet (1) is correctly seated.

Slacken nut (2).

Installation Note:
Tightening torque, 64 53 7AZ. [1][2]Expansion Valve

Detach refrigerant lines (3) and (4) in direction of arrow.

Installation Note:
Replace sealing rings and moisten with refrigerant oil.





Release screws (1).

Installation Note:
Tightening torque, 64 53 9AZ. [1][2]Expansion Valve

Detach expansion valve (2) in direction of arrow.

Installation Note:
Replace sealing rings and moisten with refrigerant oil.
Make sure soundproofing (3) is correctly seated.





After installation:
- Evacuate and fill A/C system Drawing off, Evacuating and Filling A/C System (R 134a)