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ISM, ISMe, and QSM11 – 008-024   Fan Clutch, Air-Disengaged

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This type of fan clutch is engaged by spring tension and is disengaged by air pressure.

This type of fan clutch requires air pressure for free rotation. In the event of air pressure loss, the fan will be engaged.

Air pressure of 480 to 830 kPa [70 to 120 psi] is required to override the clutch spring tension to disengage the fan.

  
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If the fan does not operate within the temperature range indicated on the coolant temperature sensor (1), the fan clutch and the controls must be checked. Refer to the OEM service manual.

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Last Modified:  23-Jan-2009
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