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 R134a refrigerant 64 50 ... Instructions For Handling Refrigerant R 134a.
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!
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 31 062 Removing and Installing/Replacing Left Lower Microfilter Housing Section
- Remove left suspension cross-brace 51 71 345 Removing and Installing/Replacing Left (or Right) Suspension Cross-Brace





Note:
Work described on the E90 by way of example, deviations in detail are possible in other vehicles.

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).

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