ISM, ISMe, and QSM11 – 008-026   Fan Clutch, Electric

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 electrical connections, negative (-) cable first, from the batteries. Refer to the OEM service manual.
• Disconnect the fan clutch connector on the base harness from the fan clutch.
• Remove the fan from the engine. Refer to the OEM service manual.
• Remove the fan drive belt. Refer to Procedure 008-002 in Section 8.

Remove the fan hub, clutch and capscrews from the engine.

This type of fan clutch is activated when 12-VDC from the vehicle electrical system is applied.

The clutch will disengage when 0-VDC is applied.

If the fan does not operate within the temperature range on the coolant temperature sensor (1), the fan clutch and the controls must be checked.

Inspect wires and harnesses to make sure none are broken or shorted. Replace harnesses or wires that are broken. Refer to Procedure 008-069 in Section 8.

The Cummins® electric fan clutch contains an electromagnetic coil. If the fan is not operating and all electrical circuits are OK, the coil possibly has an open circuit.

Measure the continuity across the isolated coil. Connect one multimeter lead to pin A in the fan clutch connector. Connect the other lead to pin B.

The resistance must be within 6-10 ohms. If the resistance is not within this range, replace the fan clutch.

Install the fan hub, clutch, and capscrews. Tighten the capscrews alternately and evenly.

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.

• Install the fan drive belt. Refer to Procedure 008-002 in Section 8.
• Install the fan from the engine. Refer to the OEM service manual.
• Connect the fan clutch connector on the base harness to the fan clutch.
• Connect the batteries, negative (-) cable last. Refer to the OEM service manual.
• Operate the engine and check for proper operation.