Yeah parasitic losses, and reduce & simplify. Access to the front of the engine is much easier without the fan in the way and its one less expensive thing to worry about. I take them off all my Audis tbh. It makes more performance difference to the 1.9s than it does to a V8 but still worth doing while it was all in bits.
Its wired up so the AC controller brings it on so it does run most of the time when the car is stationary as otherwise without the viscous fan the AC wouldn't get cold. It does go off in Econ though.
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