As some may know, the cost of a replacement viscous coupling hub for the 505 STI / GTI radiator fan is mind-blowing. It seems no change from $600 is to be expected.
Has anybody found a cheaper non-genuine source?
Otherwise, the alternative seems to be to replace the unit with a large thermatic fan, powered via the radiator thermo-switch and a relay. Anybody running this set-up, and if so, what efficiency are you getting in summer in regard to keeping normal engine temperatures?