64 51 526 Removing And Installing Or Replacing Expansion Valve

64 51 526 - Removing and installing or replacing expansion valve





Special tools required:





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]64 50 ... Safety Instructions for Handling Refrigerant Oil.





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:Replacing drier insert for A/C system 64 53 517 Replacing Desiccant Insert For Air Conditioning System





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 acoustic insulation from bulkhead upper section





Recycling
Coolant emerges when coolant lines are detached. Have a suitable collecting container ready.

Catch and dispose of escaping coolant.

Observe country-specific waste-disposal regulations.





Feed out line penetration (1) towards top.





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

Tightening torque 64 53 1AZ 64 53 Refrigerant Lines and Expansion Valve.

Replace sealing rings and moisten with refrigerant oil.

Note:
Use special tool 00 9 316 to mount sealing rings without damaging them.





Rear air conditioning only:

Release screw (1).

Tightening torque 64 53 1AZ 64 53 Refrigerant Lines and Expansion Valve.

Remove refrigerant line (2) with associated seal.

Replace sealing ring and moisten with refrigerant oil.

Note:
Use special tool 00 9 316 to mount sealing rings without damaging them.





Unscrew nuts (1).

Feed out refrigerant sealing plate (2) towards top.





Feed out foam material (1).

Unfasten screws (2).

Tightening torque 64 53 2AZ 64 53 Refrigerant Lines and Expansion Valve.

Carefully remove flange (3) with expansion valve behind.

Replace sealing rings and moisten with refrigerant oil.

Note:
Use special tool 00 9 316 to mount sealing rings without damaging them.

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





After installation:

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