Coolant Circulation For Alternator And Fuel Cooling; Pump For Coolant After-Run V51; Recirculation Pump V55; Pump For Fuel Cooling V166 - Volkswagen V10-TDI Manual

1. Cooler for Engine Coolant Circulation
2. Cooler for Alternator/Fuel Cooling

3. Pump for Coolant After-run V51

4. Check Valve

5. Pump for Fuel Cooling V166

6. Valve Body
7 . Cylinder Head/Cylinder Block
8. Generator (Alternator)
Coolant Circulation for Alternator and Fuel
Cooling
In the Touareg, the V10-TDI engine has a
separate coolant circulation for the alternator
and the fuel cooling. This is required because
the temperature of the coolant is too high to
cool the returning fuel when the motor is
running.
Pump for Coolant After-run V51
The pump for coolant after-run is an electrically
driven pump that is activated by the Engine
Control Module (ECM).
It fulfills two duties:
1. At low engine speeds, the pump for coolant
after-run supports the mechanically-driven
coolant pump, thus providing for sufficient
coolant circulation.
2. To carry out the coolant after-run function,
the pump is activated by the ECM according
to a characteristic map.
Engine Mechanics
9. Fuel Cooler
10. Compensator Reservoir

11. Recirculation Pump V55

12. Heater Core for Heater
13. Auxiliary Water Heater (Auxiliary Heater)
14. Cooler for Exhaust Return (Phaeton only)
15. Engine Coolant Temperature (ECT) Sensor
G62
16. Coolant Temperature Sensor - Radiator
Outlet G83
Recirculation Pump V55
The fuel cooling pump is an electrical circulation
pump. If required, it is activated by the
Climatronic control unit, providing coolant
circulation for the alternator and the fuel cooling.
1. When the engine is running, the pump
provides an increased flow of coolant
through the heater core for the heater; it also
supports the functioning of the auxiliary
heater.
2. The pump fulfills the duties of the residual
heat function up until 30 minutes after the
engine is stopped. For this purpose, it is
activated by the Climatronic control unit
when the driver activates the residual heat
function.
Pump for Fuel Cooling V166
The fuel cooling pump is an electrical circulation
pump. If required, it is activated by the ECM,
providing coolant circulation for the alternator
and the fuel cooling.
25