Hose/Line HVAC: Service and Repair

64 53 761 Pressure Line From Connecting Piece to Rear Heater - A/C System

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 .







IMPORTANT:
Observe safety instructions for raising the vehicle
Risk of damage.
Restart engine only when A/C system has been correctly filled.
Follow instructions 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







To ensure that the refrigerant is almost completely drained from the rear air conditioner:
In the diagnosis system under Service functions carry out the instruction for "Draining/filling refrigerant circuit".







Necessary preliminary tasks:
- Drawing off, evacuating and filling the A/C system are not included in the time value given for this work operation
- Remove entire exhaust system
- Remove heat shield at rear.
- Remove underbody panelling







Slacken nut (1).
Take off holder (2).







IMPORTANT: Secure rear axle support against falling out.

Slacken screws (1) on right compression strut (2), do not unscrew fully.
Tightening torque 33 33 2AZ .
Slacken screw (3) (do not unscrew fully).
Tightening torque 33 33 1AZ .







Slacken screws (1) on rear axle support at rear right (2), do not unscrew fully.
Tightening torque 33 33 1AZ .
Gently lower rear axle at rear right to make it easier to feed out refrigerant lines later.







Unlock and open respective clamp (1).







Release screw (1).
Disconnect pressure line (2) from pressure line (3).

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







Unclip pressure line (1) from holder (2).







Release corresponding screw (1).
Tightening torque 64 53 5AZ .
Carefully detach respective refrigerant line (3) downwards from expansion valve (2).

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







Unlock and open respective clamp (1).
Feed out corresponding refrigerant line (2) between vehicle underbody and rear axle support (3).







After installation:
Evacuate and fill A/C system