Audi V8 - Engine Mechanics: Cooling Circuit

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Engine - Mechanics
The flow direction of the coolant has been
changed in the new V8 5-valve engines.
As with the V6 engines, the coolant leaving
the cylinder heads merges in the rear coolant
pipe from where it is then led off to the
cooler.
SSP217_015
Cooling circuit
(Example: A8)
Return from oil
cooler
Heat exchanger / valve
unit
Coolant temperature
sender G2 and G62
Radiator fan thermo
switch F18/F54
Coolant pipe
(return for heater, oil
cooler and expansion
tank)
Breather pipe
New coolant pipe to
cylinder head
(small cooling circuit)