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M11 Series – Service Manual – 008-024   Fan Clutch, Air-Disengaged

General Information

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On CELECT™ and CELECT™ Plus engines, all fan clutches can be controlled by the electronic control module (ECM). The ECM is programmed to turn the fan ON when 0 VDC (normally open switch) is applied to the fan clutch relay, and turn the fan OFF when 12 VDC (normally closed switch) is applied to the fan clutch relay.

The following fan clutch checks are for fan clutches wired to the electronic controlled fuel system. Refer to the vehicle manufacturer’s specifications to determine the installation of the fan clutch.

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Maintenance Check

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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 fan clutch manufacturer’s service manual.

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Last Modified:  07-May-2003
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