Service Manual

Fan Hub, Belt Driven ISB, ISBe and QSB (Common Rail [...]
Page 8-58 Section 8 - Cooling System - Group 08
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205 Cool engine
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Fan Clutch, On-Off (008-027)
General Information
All fan clutches can be controlled by the engine electronic
control module (ECM). The ECM monitors coolant
temperature and intake manifold termperature to
determine when to engage the cooling fan. Some
applications have additional sensors monitored by the
ECM for fan control (for example, air conditioner pressure
and transmission temperature). These are various fan
clutch types such as:
• Air engaged
• Air disengaged
• Electric
• Viscous
• On-off.
Refer to the manufacturer's service manual to determine
fan clutch type.
The ECM is capable of using either a zero (“0”) VDC or
12/24 VDC signal to engage the fan clutch. The exact
enable logic can be selected in the Features and
Parameters section of INSITE™.
Refer to the equipment manufacturer's service manual for
fan clutch troubleshooting and repair information.
Fan Hub, Belt Driven (008-036)
Preparatory Steps
WARNING
Batteries can emit explosive gases. To reduce the
possibility of personal injury, always ventilate the
compartment before servicing the batteries. To
reduce the possibility of arcing, remove the negative
(-) battery cable first and attach the negative (-)
battery cable last.
• Disconnect the batteries. Refer to Procedure 013-009
(Battery Cables and Connections) in Section 13.
• Remove the cooling fan drive belt. Refer to Procedure
008-002 (Drive Belt, Cooling Fan) in Section 8.
• Remove the fan spacer and pulley. Refer to Procedure
008-039 (Fan Spacer and Pulley) in Section 8.