Cooling System: Description and Operation

Cooling System:



Image Legend:
1 - Water pump
2 - Crankcase
3 - Thermostat
4 - Radiator
5 - Heat exchanger, heating
6 - Oil-to-water heat exchanger
7 - ATF heat exchanger (Tiptronic only)
8 - Electric shut-off valve (Tiptronic only)
9 - Expansion tank
10 - Shut-off valve
11 - Venting line (engine)
12 - Venting line (radiator

The principle of cross-flow cooling with integrated cooling-water channelling was implemented to ensure that the cooling water is distributed evenly to all of the cylinders. A temperature drop between the individual cylinders is thus prevented. The cooling fluid is supplied through integrated lines.

As already described in the casting techniques under Oil circulation, all of the cooling channels in the engine are produced in the casting process. Additional lines or hoses in the engine are no longer required which, in turn, results in high reliability and low servicing requirements.