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Fan Clutch Test - Maximum Speed Requirement

WARNING: This page is about a different car, the 2004 Ford Pickup, 2004 Ford F550 Super Duty, 2004 Ford F450 Super Duty, 2004 Ford Excursion, and 2004 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform Steps 1 through 5 of the Fan Clutch Test-Minimum Speed Requirement.
    2. NOTE: The temperature of the air hitting the fan clutch should be above 96°C (205 °F) for maximum fan speed.
  2. Block off areas on each side of the radiator in the engine compartment and the front of the radiator grille. This will raise the temperature of the air striking the fan clutch and should cause the fan blade to operate at maximum speed.
  3. Place the climate control in panel mode, A/C and recirculated air requested (if available) and the blower motor switch in the HI position.
  4. Adjust the strobe to 4,320 RPM for 5.4L and 6.8L engines.
    5. WARNING: To avoid the possibility of personal injury or damage to the vehicle, do not operate the engine until the fan blade has been first examined for possible cracks and separation.
  5. Start the engine and adjust the engine speed until the strobe light flash and the coolant pump pulley mark are synchronized.
  6. Aim the strobe light at the fan blade retaining bolts. Adjust the strobe light until the light flash is synchronized with the marked fan blade bolt (the fan blade appears to stand still).
  7. If the fan blade speed is less than 3,600 RPM on 5.4L engines and 3,500 RPM on 6.8L engines, install a new fan clutch.
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