Radiator and Charge Air Cooled Fins
(1-16)
Inspection
Visually inspect the radiator for plugged radiator fins.
Use 550 kPa [80 psi] air pressure to blow the dirt and
debris from the fins. Blow the air in the opposite direc-
tion of the fan air flow.
Inspect the CAC and the clearance between the CAC and
radiator for trapped debris. Remove if neccesary.
Remove any debris found.
Visually inspect the radiator for bent or broken fins.
NOTE: If the radiator must be replaced due to bent or
broken fins which can cause the engine to overheat, refer
to the manufacturer’s replacement procedures.
Visually inspect the radiator for core and gasket leaks.
Radiator Shutter Operation (1-17)
Shutterstats
Checking - Cooling System Temperature
Actuation
Check the shutterstats and the thermatic fan annually.
NOTE: Dual control systems are required for automatic
radiator shutters and thermatic fans. Shutters must open,
fans turn ‘‘ON’’ whenever the intake manifold air temper-
ature rises above its sensor set point or whenever the engine
coolant outlet temperature rises above its sensor set point.
Either conditon -- high coolant temperature or high intake
manifold temperature -- must activate the shutters and/or
fan.
NOTE: If winterfronts or radiator covers are used, a mini-
mum fixed opening of 120 square inches (i.e., 10 x 12
inches,5x24inches, etc.) is required at all times.
Shutterstat and thermatic fan controls must operate in
the same temperature range as the thermostat with which
they are used. Refer to the Thermal Control Settings
Graph in the front of this section.
Section 1 - Cooling System Radiator and Charge Air Cooled Fins (1-16)
N14 Page 1-37
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