Section 05: COOLING SYSTEM
PA1562
18
130 psi: fan HIGH SPEED
disengages
pressure dropping
90 psi: fan LOW SPEED
disengages
WARNING
DO NOT work near the fan with the engine
running or the ignition 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. Set the ignition key 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 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. Set the ignition to the OFF position and
remove the key from the contact switch 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. 24).
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 24: MECHANICAL LOCKING 05124
13.2 MAINTENANCE
1. Clean the fan and related parts with clean
fuel oil and dry them with compressed air. Do
not clean with steam or high-pressure jet.
2. Check the fan blades for cracks or other
damage. Replace the fan if the blades are
cracked or deformed.
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