Connection Diagram - Coolant Hoses, Vehicles With 3.0L Engine, With Parking Heater

• Blue = large coolant circuit.
• Red = small coolant circuit.
• Orange = cylinder block coolant circuit.
• Brown = heating circuit.
• Green = coolant circuit for the transmission.
• Arrows = coolant flow direction.

Fig 1: Coolant Hoses Connection Diagram (Vehicles With 3.0L Engine, With Parking Heater)

Courtesy of AUDI OF AMERICA, LLC

1. Radiator
2. Engine Coolant Temperature Sensor on Radiator Outlet -G83-
3. Engine Coolant Temperature Sensor on Engine -G82-
4. Coolant Shut-Off Valve
   • Vacuum-controlled
5. Engine Temperature Control Sensor -G694-
6. Parking Heater
   • With Recirculation Pump -V55-
7. Cylinder Head
   • Cylinder Bank 1 (Right)
8. Heater Coolant Shut-Off Valve -N279-
9. Cylinder Block
10. Bleed Hole
11. Heater Core for the Heater
12. After-Run Coolant Pump -V51-
13. Cap
    • Checking the pressure relief valve. Refer to COOLING SYSTEM, CHECKING FOR LEAKS .
14. Coolant Expansion Tank
15. Coolant Thermostat
    • For the ATF coolant circuit
16. ATF Cooler
17. Check Valve
18. Turbocharger
19. Restrictor
20. Engine Oil Cooler
21. Cylinder Block
22. Cylinder Head
    • Cylinder Bank 2 (Left):
23. Engine Coolant Temperature Sensor -G62-
24. Restrictor
25. Restrictor
26. Map Controlled Engine Cooling Thermostat -F265-
27. Coolant Pump
    • Activated by the Mechanical Coolant Pump Switch Valve -N649-
28. Check Valve