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Coolant Hose Connection Diagram

WARNING: This page is about a different car, the 2012 Volkswagen Touareg and 2011 Volkswagen Touareg. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:

Blue = large coolant circuit.

Brown = heating circuit.

Green = fuel system coolant circuit.

Orange = exhaust gas recirculation coolant circuit.

Red = small coolant circuit.

Fig 1: Identifying Coolant Hose Connection Diagram
GWWA19-10810Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.
  1. Fuel System Cooler
    • Change the coolant after replacing
  2. Fuel Cooler Pump -V166-
    • Discontinued beginning with MY 2010
  3. Check Valve
    • The arrow points in the flow direction
  4. Radiator
    • Change the coolant after replacing
  5. Engine Coolant Temperature Sensor on Radiator Outlet -G83-
  6. Bleed Screw
  7. Coolant Thermostat
    • For the exhaust gas recirculation coolant circuit
  8. Coolant Thermostat
  9. EGR Cooler Pump -V400-
    • In the exhaust gas recirculation coolant circuit
  10. Generator
  11. Engine Oil Cooler
  12. Cylinder Head Bank 1 (Right)
    • Change the coolant after replacing
  13. Coolant Expansion Tank
    • Replace the seal if damaged.
    • Perform a leak test with Cooling System Tester:VAG1274  and Cooling System Tester - Adapter:VAG1274/8  . Refer to.
    • Check the cap with Cooling System Tester:VAG1274B  and Cooling System Tester - Adapter:VAG1274/9  .
    • Test pressure 1.4 to 1.6 bar (20.30 to 23.20 psi)
  14. Coolant Reservoir Cap
  15. Engine Coolant Temperature Sensor -G62-
  16. Bleed Screw
  17. Auxiliary EGR Cooler
    • Installed only on vehicles with engine code CATA
  18. EGR Cooler
    • Change the coolant after replacing
  19. EGR Cooler Bypass Valve
  20. From Heater Unit Heat Exchanger
  21. To Heater Unit Heat Exchanger
  22. Cylinder Head Bank 2 (Left)
    • Change the coolant after replacing
  23. Cooling Element
    • On the fuel filter
  24. Bleed Screw
  25. Coolant Thermostat
    • For the exhaust gas recirculation coolant circuit
    • With EGR Motor -V338-
  26. Coolant Pump
  27. Bleed Screw
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