Connection Diagram - Coolant Hoses, Vehicles Without Transmission Fluid Heater, With Parking Heater

NOTE:

Blue = large coolant circuit.

Red = small coolant circuit.

Brown = heating circuit.

Fig 1: Coolant Hose Connection System Diagram

Courtesy of AUDI OF AMERICA, LLC

1. Radiator
2. Turbocharger
3. Cylinder Head/Cylinder Block
4. Parking Heater
5. Bleed Hole
6. Heater Coolant Shut-Off Valve -N279-
7. Heater Core for the Heater
8. Check Valve
   • The arrow points in the flow direction
9. Coolant Pump
10. Restrictor
11. Coolant Expansion Tank Cap
    • Checking the pressure relief valve. Refer to COOLING SYSTEM, CHECKING FOR LEAKS .
12. Coolant Expansion Tank
13. Check Valve
14. After-Run Coolant Pump -V51-
    • Installed only on hot climate vehicles
15. Coolant Thermostat
16. Engine Oil Cooler
17. Engine Coolant Temperature Sensor -G62-