Air Supply Unit Without Solenoid Valve Block

Air Supply Unit without Solenoid Valve Block

Special tools, testers and auxiliary items required

• Torque Wrench 5-50 Nm (V.A.G 1331)

• Torque Wrench (V.A.G 1783)

• Standard socket open end 12 mm

Removing

- Place vehicle on hoist. Refer to => [ Positioning Vehicle on Hoist and Wheels ] Positioning Vehicle on Hoist and Wheels.

- Perform system vent at front axle with (VAS 5051B) => [ System, Venting or Filling ] System, Venting or Filling.

- Remove right underbody trim.

- Disconnect intake line - 1 - at clutch.






- Disconnect the electrical connections - 1 and 2 - between the air supply unit and the body.






- Remove cable ties - arrows -.

- Remove air line - 2 - and then air line - 1 - from solenoid valve block.






Air lines - 3 and 6 - must not be disconnected.

1. Black, internal air line between solenoid valve block and compressor

2. Green, air line toward right front air spring shock absorber

3. Red, air line toward left rear air spring shock absorber

4. Violet, air line to left front air spring damper

5. Blue, air line toward pressure reservoirs

6. Yellow, air line toward right rear air spring shock absorber


- Pull air lines out of bracket at underbody.

- Remove nuts - arrows A - for air supply unit.






- Remove bolts - arrows B - and secure air supply unit with bracket (second technician required).

- Lower air supply unit with bracket enough at front to remove air supply unit - 1 -.






• Make absolutely sure that the solenoid valve block - 2 - is moved from underbody as little as possible.

• Furthermore, the air lines must not be kinked or stretched under any circumstance

Installing

Install in reverse order of removal. Note the following:

- First tighten nut - arrow A - and then nut - arrow B - to avoid tension in rubber bushing.






Tightening specifications, refer to => [ Air Supply Unit and Solenoid Valve Block Overview ] Air Supply Unit and Solenoid Valve Block Overview

- Install right underbody trim.

- Place vehicle on wheels. Refer to => [ Positioning Vehicle on Hoist and Wheels ] Positioning Vehicle on Hoist and Wheels.

If the air supply unit was replaced, then the level control system compressor relay (J403) must also be replaced.