The supply for fan
N11
arrives directly
from the battery from the line for the VENT maxifuse of
B6
up
to 2/99 or FAN 1 of
B99
from 2/99: the fan therefore works
when it receives an earth command.
The relays
J30
and
J31
, specific
to the cooling system, receive a supply at their coils controlled
by the ignition (15/54) protected by fuse
B25
up to 2/99
or fuse
F4
of the additional fuse box
B98A
from 2/99.
They are energized by an earth signal coming
from the engine control unit
M10
.
If the engine coolant reaches a first temperature
level, the control unit
M10
sends (from pin 23 of connector
B) an earth signal to the fan 1st speed relay
J30
which energizes
the coil. The relay then sends an earth signal which, via the additional
resistor
O10
, operates the fan
N11
which rotates at
the first (slow) speed.
If the engine coolant reaches a higher temperature,
the control unit
M10
sends (from 45 of connector C) an earth
signal to the fan 2nd speed relay
J31
which energizes the
coil. The relay then sends an earth signal directly to the fan
N11
which
rotates at the maximum speed.