Notes on viscous fan clutch - AH20.40-P-0001-01AO
WARNING: This page does not describe the selected car, but rather 42 other vehicles, including the 1999 Mercedes-Benz S600, 1999 Mercedes-Benz S500, 1999 Mercedes-Benz S420, 1999 Mercedes-Benz S320, and 1999 Mercedes-Benz CL600. However, it is still accessible from the selected car via links, so may be relevant.
Transportation and storage
Temperature-controlled viscous fan clutches should be transported upright. For short periods - for example for installation purposes - the clutch may be placed on the flange side, but never on the front. The cast part number of the fan should be positioned at the front (radiator side).
The bimetal strip must not be bent or damaged.
The 9-vane fan has been modified to an 11-vane fan.
Production breakpoint as of engine: 120.980-12-017 433
120.981-12-000 534
The 11-vane fan must be used only together with the strengthened coolant pump 120 200 10 01.