NOTE: If winterfronts or radiator covers are used, a mini-
mum fixed opening of 120 square inches (i.e., 10 x 12
inches, 11 x 11 inches, 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, shown in the front of this section.
Install a master temperature gauge which is known to be
accurate into the thermostat housing. A thermocouple
can be used.
Restrict the radiator air flow.
Operate the engine at rated RPM.
If the vehicle is air-conditioned, make sure the air-
conditioning is turned off to prevent continuous operation
of the fan. When the coolant temperature reaches 93°C
[200°F], check for fan engagement.
NOTE: Fan noise and air flow increase when the fan clutch
engages.
Return the engine to idle, and remove the radiator air
restriction.
On-Off Thermatic Fan Clutch (1-24) Section 1 - Cooling System
N14Page 1-52
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