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Home >> Audi >> 2012 >> Q7 3.0 TDI >> Repair and Diagnosis >> External Pages >> Different car >> Section 15 (3.0L - Cooling System - Engine Code: CATA) >> 19 Cooling System >> Coolant System >> Coolant Hose Connection Diagram

Coolant Hose Connection Diagram

WARNING: This page is about a different car, the 2011 Audi Q7, 2010 Audi Q7, and 2009 Audi Q7. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:

Risk of scalding due to hot steam and hot coolant.

  • The coolant system is under pressure when the engine is warm.
  • Cover the coolant reservoir cap with a cloth and then open it slowly to release the pressure.
NOTE:

When the engine is warm the cooling system is under pressure. If necessary release pressure before commencing repair work.

Arrows on coolant pipes and coolant hoses must line up across from each other.

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 AUDI OF AMERICA, LLC
  1. Fuel System Cooler
    • Change the coolant after replacing
  2. Fuel Cooler Pump -V166-
  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 Reservoir
  14. Coolant Reservoir Cap
  15. Engine Coolant Temperature Sensor -G62-
  16. Bleed Screw
  17. Auxiliary EGR Cooler
  18. EGR Cooler
  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. Fuel Cooler
    • On the fuel filter.
    • Only vehicles built through 05.10.
  24. Bleed Screw
    • Only vehicles built through 05.10.
  25. Coolant Thermostat
    • For the exhaust gas recirculation coolant circuit.
    • With EGR motor -V338-.
  26. Coolant Pump
    • Only vehicles built through 05.10.
  27. Bleed Screw
    • Only vehicles built through 05.10.
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