[PDF] EC450TM ELECTROMAGNETIC FAN CLUTCH (STANDARD After the unit is completely installed, test the Fan Clutch as follows: 1. Start the engine and cycle the Fan Clutch on and off 10 to 15 times using the Manual Override Switch, or installing a jumper wire across the Temperature Switch Wiring Harness connector. This will seat the clutch faces, insuring maximum life from your Horton Fan Clutch. 2.
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