Expansion Valve: Service and Repair

64 51 520 Removing And Installing Or Replacing Expansion Valve

Special tools required:







WARNING:
Danger of injury.
Refrigerant circuit is under high pressure.
Follow safety instructions for handling R 134a refrigerant.
Avoid contact with refrigerant and refrigerant fluid.
Follow safety instructions for handling refrigerant fluid.







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.

NOTE: If air conditioning system is opened for more than 24 hours: Replace desiccant insert for heating and air conditioning system.







Necessary preliminary tasks:
- Draw off refrigerant from air conditioning system
- Remove intake filter housing.
- N47 only: Remove right charge-air duct







Slacken nut (1).
Disconnect refrigerant lines (2).
Tightening torque 64 11 4AZ.

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







Release screw (1) and screw in special tool 64 1 140.
Release screw (2) and feed out expansion valve (3) towards front.
Tightening torque 64 11 5AZ.

Installation note:
Make sure expansion valve is correctly seated on seal.







Installation note:
Replace all sealing rings on twin pipes (2).
Use special tool 00 9 030 to mount sealing rings without damaging them.
Carefully insert expansion valve (1).
Grip mounting plate (3) with special tool 64 1 140 and secure expansion valve (1) with a screw.