Rear coolant line, removing and installing

WARNING: This page is about a different car, the 2006 Audi A4, 2005 Audi A4, 2004 Audi A4, 2003 Audi A4, and 2002 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

Removing

NOTE: All cable ties opened or cut during engine removal must be reinstalled at the same locations during installation.

Remove right coolant line. Refer to Right coolant line, removing and installing .
Expose wires at hose of crankshaft housing ventilation.

Fig 1: Removing Hose Of Crankshaft Housing Ventilation

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Courtesy of VOLKSWAGEN UNITED STATES, INC.

Remove hose of crankshaft housing ventilation (arrow).

Vehicles with automatic transmission

Fig 2: Disconnecting Vacuum Hose To Brake Booster

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Courtesy of VOLKSWAGEN UNITED STATES, INC.

Disconnect vacuum hose to brake booster (arrows).

All

Remove heat shield for harness connectors at left of bulkhead, if installed.

Fig 3: Identifying Coolant Hose, Bolts, Nut & Combination Valve

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Courtesy of VOLKSWAGEN UNITED STATES, INC.

Remove coolant hose -4-.
Remove bolts -2- and nut -5- and remove hose for secondary air injection.
Disconnect vacuum hose -3- from combination valve.
Remove bolts -1- and remove combination valve for secondary air injection.

Remove coolant hose -6-.

NOTE: The illustration is shown with the engine removed.

Fig 4: Disconnecting Electrical Harness Connector At Engine Coolant Temperature (ECT) Sensor -G2-/-G62-

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Courtesy of VOLKSWAGEN UNITED STATES, INC.

Disconnect electrical harness connector -2- at Engine Coolant Temperature (ECT) sensor -G2-/-G62-.
Disconnect hydraulic line of power steering at rear coolant line -1-.
Remove screw clips for electrical wiring harness at rear coolant line.
Expose electrical wires at rear coolant line.

Fig 5: Removing Bolts & Catalytic Converter Toward Rear

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Courtesy of VOLKSWAGEN UNITED STATES, INC.

Remove bolts -1- and -2-.
Remove catalytic converter toward rear.

Installing

Installation is reverse of removal, noting the following:

NOTE:

Secure all hose connections using hose clamps appropriate for the model type:
Replace seals and O-rings.

Clean and/or smooth O-rings sealing surface before installing.
Coat new O-rings with G12 and slide onto coolant line.
Install right coolant line. Refer to Installing .

Tightening torques

Component	Nm
Rear coolant line to cylinder head	10
Power steering pressure line to coolant line	20
Connecting tube to combination valve	10
Connecting tube to rear coolant line	10