Part I

WARNING: This page is about a different car, the 2006 Audi A8, 2005 Audi A8, and 2004 Audi A8. However, it is still accessible from the selected car via links, so may be relevant.

Part II → Part II

Fig 1: Connection Diagram For Coolant Hoses (With Auxiliary Heater) Part I

Courtesy of VOLKSWAGEN UNITED STATES, INC.

1 - Radiator

Replace coolant after replacing

2 - To auxiliary heater

3 - Oil filter bracket

With oil cooler
Removing and installing → Oil filter housing, removing and installing

4 - Generator

Liquid-cooled

5 - From auxiliary heater

6 - Expansion tank

With sealing cap
Pressure relief valve in cap, checking

7 - Oil cooler for automatic transmission oil

8 - Cylinder head/cylinder block

Replace coolant after replacing

9 - Coolant pump

Removing and installing → Coolant pump, removing and installing

10 - Coolant thermostat

Removing and installing → Coolant thermostat, removing and installing, checking
Checking → Thermostat, checking