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Fan Clutch Test - Minimum Speed Requirement

WARNING: This page is about a different car, the 2018 Ford F-350 Super Duty and 2018 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
  1. Use a suitable marker to mark the coolant pump or fan pulley and one of the fan blades.
  2. Make sure the A/C is OFF, if equipped.
  3. WARNING: Do not stand in line with or near the engine cooling fan blade when revving the engine. A damaged fan can separate during operation. Failure to follow this instruction may result in serious personal injury.

    Start the engine and run it at approximately 2, 000 rpm for 5 minutes or until there is a noticeable reduction in fan noise to allow the fan clutch to go into disengaged mode.

  4. Aim a laser photo tachometer at the coolant pump or fan pulley. Run the engine to achieve 3, 000 rpm at the coolant pump or fan pulley.
  5. Aim a laser photo tachometer at the coolant pump or fan pulley. Run the engine to achieve 3, 000 rpm at the coolant pump or fan pulley.
  6. With the coolant pump or fan pulley at 3, 000 rpm, aim the laser photo tachometer at the fan blade. Monitor and record fan speed.
  7. The fan blade speed must be less than the specified rpm at 3, 000 rpm coolant pump or fan pulley rpm. Refer to Fan Clutch Test Specifications  for correct fan speed.
  8. Turn the engine off.
  9. If the fan blade speed was greater than specified, install a new fan clutch.
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