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

• Blue = large coolant circuit.
• Red = small coolant circuit.
• Orange = coolant circuit for the charge air cooler.
• Brown = heating circuit.
• Green = coolant circuit for the transmission.
• Arrows = coolant flow direction.

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. Engine Oil Cooler
5. Suction Jet Nozzle
6. Heater Coolant Shut-Off Valve -N279- :
7. Parking Heater
   • With Recirculation Pump -V55-
8. Starter Generator -C29-
9. Cylinder Head
   • Cylinder Bank 1 (Right)
10. Restrictor
11. Bleed Hole
12. Heater Core for the Heater
13. Cylinder Block
14. After-Run Coolant Pump -V51-
15. Engine Temperature Control Sensor -G694-
16. Coolant Shut-Off Valve
    • Vacuum-controlled
17. Coolant Thermostat
    • For the ATF coolant circuit
18. ATF Cooler
19. Cap
    • Checking the pressure relief valve. Refer to COOLING SYSTEM, CHECKING FOR LEAKS .
20. Coolant Expansion Tank
21. Cylinder Block
22. Restrictor
23. Cylinder Head
    • Cylinder Bank 2 (Left):
24. Engine Coolant Temperature Sensor -G62-
25. Check Valve
26. Restrictor
27. Turbocharger
28. Map Controlled Engine Cooling Thermostat -F265-
29. Coolant Pump
    • Activated by the Mechanical Coolant Pump Switch Valve -N649-
30. Check Valve