3026213 - E5020 ENGINE COOLING - Functional description (Riscaldatore)

Functional description

The relays T6 and T7 in the engine compartment unit B1 manage the switching on of the fan N11 at two speeds: their coils are supplied by the ignition-controlled line (15/54), while the power lines are protected by the fuses F6 and F7, of the engine compartment unit B1 . Both are energized by a control signal - earth - coming from the engine control unit M10 . If the engine coolant reaches a first temperature level, the control unit M10 sends a signal from pin 20 of connector A to the fan 1 speed relay T6 which sends a supply to the fan N11 via the additional resistance O10 which rotates at the first speed (slow). If the coolant reaches a higher temperature level, the control unit M10 sends a signal - from pin 19 of connector A - to the fan 2nd speed relay T7, which sends the supply directly to the fan N11: the fan then turns at the maximum speed.