Various models of fans
The radiator fan – if it sufficiently is not supplied with a stream of counter air – has to create a constant stream of air in radiator plates. Air absorbs the warmth given by a radiator. The more passes air through plates, the heat is taken away better.
On Audi A4 the serial so-called viscous fan is put. Cars only with "the strengthened cooling" (for example, with the automatic transmission, coupling of the trailer, climatic installation) can be supplied with one additional or two, is exclusive with the electric drive, radiator fans.
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