Air Supply Unit, 8-Cylinder, Removing and Installing

WARNING: This page is about a different variant/trim than selected.

Fig 1: Identifying Special Tools - Air Supply Unit, 8-Cylinder, Removing And Installing

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Special tools, testers and auxiliary items required

Torque wrench V.A.G 1331
Torque wrench V.A.G 1783
Insert tool 10 V.A.G 1783/1

Removing

NOTE:

The air supply unit is installed at the left behind the front bumper.

Place vehicle on a hoist → POSITIONING VEHICLE ON HOIST AND WHEELS .
Vent system → System, Venting or Filling .
Remove wheel covers, remove cover cap on light-alloy wheels (removal hook in vehicle tool kit).
Remove the left front wheel.

Secure brake disc with a wheel bolt.

Fig 2: Identifying Exhaust Pipe Fasteners

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On vehicles with an auxiliary heater, remove the bolts - arrows - connecting the exhaust pipe to the noise insulation.

Fig 3: Front Sound Insulation Fasteners

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Loosen quick-release fasteners - 1 - and - 2 - and remove the noise insulation.

Fig 4: Front Wheel Housing Liner Bolts

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Remove bolts - 1 - from front wheel housing liner.

Fig 5: Front Wheel Housing Liner Bolts & Rear Wheel Housing Liner

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Remove both bolts - arrows - from front wheel housing liner.

Do not remove rear wheel housing liner - 2 -.

Fig 6: Front Wheel Housing Liner Upper Bolt

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Remove upper bolt - arrow - from front wheel housing liner.

NOTE:

Press the locking pins on the wheel housing liners only about 5 mm into the expanding clip and not all the way through.
This releases the locking pin so it can be removed.
When installing, slide the locking pin back and the expanding clip can be used again.

Fig 7: Pressing Locking Pins On Expanding Clips On Front Wheel Housing Liner Into Expanding Clip Using Screwdriver

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Press locking pins on expanding clips on the front wheel housing liner - 1 - about 5 mm deep into the expanding clip using a screwdriver.
Remove expanding clip.

Fig 8: Expanding Clip

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Repeat procedure to remove the expanding clip - arrow - in the upper area of the front wheel housing liner.

Fig 9: Expanding Clip & Front Wheel Housing Liner

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Repeat procedure to remove the expanding clip - arrow - in rear area of the front wheel housing liner - 1 -.

Fig 10: Nut & Connectors

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Remove nut - 1 -.
Disconnect connectors - 2 -.

Fig 11: Clamping Sleeve, Intake Hose, Connecting Piece, Nut & Air Line From Air Supply Unit

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Open clamping sleeve - 1 - and remove intake hose - 2 - from the connecting piece - 3 -.
Remove air line from air supply unit - arrow -.
Remove nuts - 4 - and air supply unit.

NOTE:

The illustration does not show the bumper.

Installing

Installation is in reverse order of removal. Observe the following when doing so:

Fig 12: Clamping Sleeve, Intake Hose, Connecting Piece, Nut & Air Line From Air Supply Unit

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Install air supply unit nuts - 4 -.
Install air line - arrow - on air supply unit.
Close clamping sleeve - 1 - and connect intake hose - 2 - to the connecting piece - 3 -.

Fig 13: Nut & Connectors

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Remove nut - 1 -.
Connect connectors - 2 -.
Install front noise insulation.
Install wheel housing liner → .

Mount wheel and tighten → .
Fill system → System, Venting or Filling .
Place vehicle on wheels → POSITIONING VEHICLE ON HOIST AND WHEELS .