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 7 of connector
A which energizes the fan relay T6 which sends the supply to the fan
N11 through the addtional resistance O10 the fan turns at the first
speed (slow).
If the coolant reaches a higher temperature
level, the control unit
M10 sends a signal - from pin 8 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.