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ATF cooling
Heated coolantCooled coolant
Coolant pump
Key:
649_110
The ATF cooling system is integrated in the cooling circuit of the
internal combustion engine in a parallel configuration. In 3.0l V6
TDI models the ATF cooler is flushed by the coolant flow from the
coolant pump.
If the AudiQ7e-tronquattro is equipped with a third-generation
2.0l R4 TFSI engine, the ATF cooler is flushed by the coolant run-on
pump V51.
In both cases, the rate of coolant flow is controlled by the ATF
coolant regulator in dependence on the temperature.
If the ATF cooler is leaking, coolant (glycol) will mix with the ATF.
Even the smallest quanties of coolant in the ATF can have a detri-
mental eect on clutch control.
A gylcol test will show up even trace quantities of glycol and can,
therefore, be used to rule out this cause.
If the coolant lines have been disconnected in order to carry out
repairs, the coolant circuit can be bled using the "coolant circuit
bleeding routine", available under address code 01 on the diagnos-
tic tester.
Integration in the coolant circuit
The diagram shows a section of the coolant circuit of the 3.0l V6
TDI engine (refer to page 25 of SSP 632).
The connections for coolant return from the ATF cooler as well as
heating feed and return are shown on page 83.
Coolant return line of ATF cooler
Heating return
Heater inlet
ATF coolant thermostat ATF cooler
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