Engine cooling - N12/N16: Notes
WARNING: This page is about a different variant/trim than selected.
The coolant pump is driven by a friction wheel. This switches the coolant pump on or off. In general the coolant pump is always running. If necessary the DME can switch off the coolant pump by activating the friction-gear servodrive. However, this activation only ever takes place in the warm-up phase when no heater output is requested. Activation is stored in a characteristic map.