Cooling system components, removing and installing

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2004 Audi A6, 2003 Audi S6, 2003 Audi A6, 2002 Audi S6, and 2002 Audi A6. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Always replace seals and gaskets
Draining and filling cooling system. See COOLING SYSTEM, DRAINING AND FILLING .
Checking cooling system for leaks. See COOLING SYSTEM, CHECKING FOR LEAKS .

NOTE: The following list refers to items in Fig 1.

Rear coolant line
From heater core
- With bleeder valve
To heater core
- With bleeder valve
Return hose
Filler cap for coolant expansion tank
- Checking, PRESSURE RELIEF VALVE IN FILLER CAP, CHECKING
Expansion tank
Filler hose
Thermostat
- Replacing, see THERMOSTAT, REMOVING AND INSTALLING
- Starts to open at approx. 87° C (188° F)
- Fully open at approx. 102° C (215° F)
- Opening travel approx. 8 mm (0.3 in.)
Radiator
Bracket for coolant hoses
Coolant line
- From cylinder block to oil cooler
Oil cooler
Coolant line
Coolant line to oil cooler

Fig 1: Cooling System Component Locations

Courtesy of AUDI OF AMERICA, INC.