Volkswagen 2004 Jetta, Introduction Manual

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45
Engines
Cooling System
To prevent carbon build-up on the turbine
shaft in the turbocharger, an auxiliary water
pump provides additional water circulation
for up to 15 minutes after the engine is shut
off hot. The pump forces the lower
temperature coolant against the normal
direction of flow. The coolant flows from
the radiator through the turbocharger to the
engine block and back to the cooler.
Connection
Expansion Tank
Radiator
Outlet
Engine Block
Connection
Oil Cooler
Connection
Exhaust-Driven
Turbocharger
Water Port
Connection Heat
Exchanger
Coolant
Thermostat
Radiator
Inlet
Auxiliary
Water
Pump
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