TM 9-2320-273-202-74. FAN CLUTCH CONTROLS.1.FAN CLUTCH. When actuator opens, compressed air from supply reservoir engages clutch toactuate fan.2.FAN CLUTCH ACTUATOR. Opens air connection between supply reservoir and fan clutchwhen coolant temperature rises above 190°F (88°C).3.PRIMARY RESERVOIR. Supplies air pressure to engage clutch and rotate fan when actuatoropens air connection.2-85
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