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Fan Clutch Test - Minimum Speed Requirement

WARNING: This page is about a different car, the 2007 Ford Pickup, 2007 Ford F550 Super Duty, 2007 Ford F450 Super Duty, and 2007 Ford Cab & Chassis. 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 operate the engine with the hood open until the fan blade has been examined for possible cracks and separation. A damaged fan can separate during operation. Failure to follow this instruction may result in serious personal injury.
  3. 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. 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.
  6. The fan blade speed must be less than the specified rpm at 3,000 rpm coolant pump or fan pulley rpm. Refer to the specification table in this article for correct fan speed.
  7. Turn the engine off.
  8. If the fan blade speed was greater than specified, install a new fan clutch.
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