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 maximum power.
When the coolant temperature reaches the temperature
stamped on the control, check the shutters to see if they
are open. The shutters must be fully open.
Return the engine to idle, and remove the radiator air
restriction.
Radiator Shutter Operation (1-17) Section 1 - Cooling System
N14Page 1-38
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