B5.9G, B5.9LPG – Troubleshooting and Repair Manual – 008-026   Fan Clutch, Electric

Disconnect the electrical connections, negative (-) cable first, from the batteries.

Disconnect the fan clutch connector on the base harness from the fan clutch.

Remove the fan and spacer from the engine.

Lift the tensioner, and remove the belt.

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, the fan clutch and the controls must be checked.

Electrical Connections

Visually inspect wires and harnesses to ensure none are broken or shorted. Replace harnesses or wires that are broken. Refer to Procedure 008-069.

Electromagnetic Coil

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

Measure the continuity across the isolated coil. Connect one volt-ohm meter lead to pin A in the fan clutch connector. Connect the other lead to pin B.

The resistance must be approximately 8 ohms. If the resistance is not 8 ohms, replace the fan clutch.

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

Lift the tensioner, and install the belt..

Install the fan and capscrews. Tighten the capscrews to the fan manufacturer’s specifications.

Connect the fan clutch connector on the base harness to the fan clutch.