Connection Diagram - Coolant Hoses, 2.9L Engine Without Parking Heater

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

Courtesy of AUDI OF AMERICA, LLC

1. Right Auxiliary Radiator
2. Radiator
   • For coolant circuit for electrical compressor
3. Engine Coolant Temperature Sensor on Radiator Outlet -G83-
4. Radiator
5. Coolant Pump
   • Activated by the Mechanical Coolant Pump Switch Valve -N649-
6. Map Controlled Engine Cooling Thermostat -F265-
7. Engine Coolant Temperature Sensor on Engine -G82-
8. Coolant Shut-Off Valve
   • Vacuum-controlled
9. Engine Temperature Control Sensor -G694-
10. Coolant Recirculation Pump -V50-
11. Starter Generator -C29-
12. Cylinder Head
    • Cylinder Bank 1 (Right)
13. Restrictor
14. Cylinder Block
15. Turbocharger
    • Cylinder Bank 1 (Right)
16. Bleed Hole
17. Heater Core for the Heater
18. After-Run Coolant Pump -V51-
19. Cap
    • Checking the pressure relief valve. Refer to COOLING SYSTEM, CHECKING FOR LEAKS .
20. Coolant Expansion Tank
21. ATF Cooler
22. Transmission Fluid Cooling Valve -N509-
23. Turbocharger
    • Cylinder Bank 2 (Left):
24. Engine Oil Cooler
25. Restrictor
26. Cylinder Block
27. Cylinder Head
    • Cylinder Bank 2 (Left):
28. Engine Coolant Temperature Sensor -G62-
29. Check Valve
30. Restrictor
31. Check Valve
32. Charge Air Cooling Pump -V188-
33. Charge Air Cooler
34. Electric Compressor Control Module -J1123- with Electrical Compressor
35. Left Auxiliary Radiator