IMPORTANT: On vehicles with EPA07-compliant
engines, the coolant capacity varies depending
on the engine and accessory installation. After
servicing the cooling system, always verify that
the coolant level is between the MIN and MAX
lines on the surge tank.
11. Fill the radiator with coolant. Use a 50/50 mixture
of antifreeze and water. Refer to the engine
manufacturer’s service literature for approved
coolants.
See
for engine cooling system capaci-
ties.
Coolant Capacities
*
Engine Make and Model
Coolant Volume:
quarts (liters)
Cummins ISB
30.5 (28.9)
MBE900 (6.4L)
37 (35)
*
The total coolant volume is dependent on the number and location of op-
tional passenger heaters.
Table 1, Coolant Capacities
IMPORTANT: If the heater circuit valves were
closed earlier, open the valves now.
20–03 Fan Drive Inspection
(Noise Emission
Control)
Horton Advantage® Fan Clutch
1.
Disconnect the batteries at the negative termi-
nals. Drain all air from the air system.
WARNING
Make sure the batteries are disconnected before
checking the fan clutch. If the engine starts during
this procedure, the fan could engage, which could
result in serious personal injury.
2.
Check the fan for loose rivets and missing
weights. Check for bent, cracked, or missing
blades. Tighten loose components. Replace the
fan if necessary.
3.
Check the fan belt condition and the belt align-
ment. Replace or correct as necessary.
4.
Connect the battery cables. Start the engine, and
charge the air system to 120 psi (827 kPa).
Manually engage and disengage the fan clutch.
Check the fan and the fan clutch from a dis-
tance. Look for vibration, fan blade contact, fan
clutch slippage, and overall fan clutch operation.
If the fan clutch does not operate correctly, see
Group 20
of the
Saf-T-Liner C2 School Bus
Workshop Manual
for troubleshooting and repair
procedures, or take the vehicle to an authorized
Freightliner dealer.
5.
Check for adequate clearance between the fan
and the fan shroud or other engine compartment
components in both the engaged mode and the
disengaged mode. If the clearance is not ad-
equate, make the necessary adjustments.
Horton EC450
™
Fan Clutch
NOTE: The Horton EC 450 fan clutch does not re-
quire any maintenance. If the fan drive is damaged,
replace the unit. Do not attempt to repair it.
Horton HT650
™
Fan Drive
Check for friction facing wear condition. Replace
when worn to 1/16-inch (1.5-mm) thick, when oil-
spotted, or when burn marks are visible.
Horton EC450
™
Fan Drive
The Horton EC450 fan drive does not require mainte-
nance. If the fan drive fails, it should be replaced
with a new unit. Repair work should not be at-
tempted.
Borg Warner Viscous Fan Drive
NOTE: The Borg Warner viscous fan drive does
not require any maintenance. If the fan drive is
damaged, replace the unit. Do not attempt to
repair it.
NOTICE
If the fan drive assembly is damaged, replace the
unit as soon as possible. Operating a seized or
otherwise damaged clutch reduces fuel economy,
and could cause serious engine damage.
Engine Cooling/Radiator
20
Saf-T-Liner C2 School Bus Maintenance Manual, May 2021
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