Cooling system components, removing and installing

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.

1. Rear coolant line 
2. From heater core 
   • With bleeder valve
3. To heater core 
   • With bleeder valve
4. Return hose 
5. Filler cap for coolant expansion tank 
   • Checking, PRESSURE RELIEF VALVE IN FILLER CAP, CHECKING 
6. Expansion tank 
7. Filler hose 
8. 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.)
9. Radiator 
10. Bracket for coolant hoses 
11. Coolant line 
    • From cylinder block to oil cooler
12. Oil cooler 
13. Coolant line 
14. Coolant line to oil cooler 

Fig 1: Cooling System Component Locations

Courtesy of AUDI OF AMERICA, INC.