RADIATOR FILLING PROCEDURE
The cooling System is pressurized due to thermal
expansion of coolant. DO NOT remove the radia-
tor cap while the engine and coolant are hot. Se-
vere burns may result.
1. With engine and coolant at ambient temperature,
remove radiator cap.
Note: If coolant is added using the Wiggins quick fill
system, the radiator cap MUST be removed prior to
adding coolant.
2. Fill radiator with proper coolant mixture (as speci-
fied by the engine manufacturer) until coolant is
visible in the sight gauge.
3. Install radiator cap.
4. Run engine for 5 minutes, check coolant level.
5. If coolant is not visible in the sight gauge, repeat
steps 1 through 4. Any excess coolant will be
discharged through the vent hose after the engine
reaches normal operating temperature.
Engine coolant must always be visible in the sight
gauge before truck operation.
COOLANT SYSTEM TROUBLESHOOTING
If abnormal coolant temperatures are experienced,
perform the following visual inspections and tests:
1. Check coolant level and thoroughly inspect sys-
tem for leaks.
a. Check for proper coolant/antifreeze mixture.
b. Follow engine manufacturer’s recommenda-
tions regarding use of cooling system addi-
tives.
2. Inspect radiator fins for restrictions. Be certain the
air flow through the radiator is not restricted by
debris or bent radiator fins.
3. Visually inspect fan blades for damage. Check
radiator cap sealing surfaces.
4. If equipped with a fan clutch, refer to Section “M”
for complete instructions for test and repairs if
required.
5. Refer to engine manufacturer’s Service Manual
for information regarding test and replacement of
the coolant system thermostats.
C3-4 Cooling System C03023 03/01
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