Expansion Valve: Service and Repair

64 51 520 - 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 64 50 ... Instructions For Handling Refrigerant R 134a.





Important!
Risk of damage!
Restart engine only when A/C system has been correctly filled.
Follow instructions Removal and Replacement for opening and replacing parts in refrigerant circuit!

Note:
If A/C system is opened for more than 24 hours:Replace desiccant insert for A/C system Service and Repair





Necessary preliminary tasks:
- Drawing off, evacuating and filling the A/C system 64 50 009 Drawing Off, Evacuating and Filling A/C System (R 134a) are not included in the time value given for this work operation
- Remove lower section of microfilter housing 64 31 081 Removing and Installing/Replacing Microfilter Housing





Release screws (1, 2), disconnect refrigerant lines and lay to one side.

Installation Note:
Replace all sealing rings and moisten with refrigerant oil.
Tightening torque 64 53 2AZ [1][2]Hose/Line HVAC.





Release screws (1) and remove expansion valve (2).
Tightening torque 64 53 13AZ [1][2]Hose/Line HVAC.






Installation Note:
Place expansion valve (1) exactly on refrigerant lines (2) and (3).
Fit screws of expansion valve (1) and make sure retainer (4) is correctly positioned.





After installation:
- Evacuate and fill A/C system 64 50 009 Drawing Off, Evacuating and Filling A/C System (R 134a)