Section 05: COOLING SYSTEM
16 X3-45 Commuter PA1593 DOB 2400-2489 Section 05 Updated Sept.2016
temperature
dropping
203°F: fan
HIGH
SPEED
disengages
189°F: fan
HIGH
SPEED
disengages
225°F: fan
HIGH
SPEED
disengage
s
198°F: fan
LOW
SPEED
disengages
170°F: fan
LOW SPEED
disengages
210°F: fan
LOW
SPEED
disengage
s
WARNING
DO NOT work near the fan with the engine
running or the ignition switch in the ON
position. The engine fan can engage at any
time without warning. Anyone near the fan
when it turns on could be seriously injured.
13.1 LOCKING RADIATOR FAN FOR
EMERGENCY OPERATION
13.1.1 Electrical Locking
If the cooling fan clutch does not function due to
an electrical control system malfunction and the
engine is overheating, execute the following
procedure:
1. Turn the ignition switch to the ON position.
2. Activate the dashboard Telltale Light Test
switch 3 times within 4 seconds.
3. In the engine compartment, set the starter
selector switch to REAR START and then
start the engine from the rear.
WARNING
Potential Accident Risk. Always use extreme
caution when working in the vicinity of hot,
rotating or moving parts.
While in this mode, the rear start push-button
can be used to manually engage the fan clutch.
The multiplex system knows when the engine is
already running, and it will not activate the
starter.
4. Press the push-button one time to engage
the clutch to 1
st
speed, press a second time
to engage to 2
nd
speed, press a third time to
stop the fan, press once again to return to 1
st
speed.
NOTE
If the fan clutch does not engage using this
procedure then the clutch is faulty or the
wiring between the multiplex module and the
clutch is faulty. Mechanically lock the fan as
described hereafter in section 13.1.2.
13.1.2 Mechanical Locking
Once mechanically locked, the fan is rigidly
connected to the drive mechanism and will
rotate continuously, with no considerations for
the cooling needs. This is an emergency
situation and the vehicle shall not be operated in
that situation for an extended period.
In case of a magnetic clutch malfunction:
1. Turn the ignition switch to the OFF position
and set starter selector switch to the OFF
position to prevent accidental starting of the
engine.
2. Disconnect the fan clutch electrical
connector.
3. Unscrew and remove the 4 spare bolts
screwed to the angle on the fan gearbox
mounting support.
4. Turn the fan blades in order to position the
locking plate bores over the rotor’s threaded
sockets.
5. Screw in and tighten the spare bolts
(Fig. 26).
6. Using the automatic belt tensioner, release
tension on the drive belt in order to be able to
rotate the fan clutch drive mechanism by
hand.
7. Rotate the shaft to get access to the second
locking plate and rotor threaded sockets.
8. Screw in and tighten the spare bolts.
FIGURE 26: MECHANICAL LOCKING 05124
To Next Page
Loading...
