Clutch fan intermittently locking up causing jet engine roaring noise

Hi,

If they are doing the same thing as the original one, chances are it isn't the part. I am going to give you the book's definition of how the fan clutch operated. Hopefully it will help you understand.

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The actuator valve controls the fluid flow from the reservoir into the working chamber. Once viscous fluid is in the working chamber, shearing of the fluid results in fan rotation. The valve is activated by a pulse width modulation (PWM) output signal from the PCM. By opening and closing the fluid port valve, the PCM controls the fan speed. Fan speed is measured through a Hall effect sensor, and is monitored by the PCM during closed loop operation. The PCM optimizes the fan speed based on the engine coolant temperature, the engine oil temperature, the transmission fluid temperature, the intake air temperature, or air conditioning requirements. When an increased demand for fan speed is requested for vehicle cooling, the PCM monitors the fan speed through the Hall effect sensor. If a fan speed increase is required, the PCM outputs the PWM signal to the fluid port, providing the required fan speed increase. During the key on, engine running (KOER) self-test, the PCM commands a 100% duty cycle. A DTC is set if the PCM detects the voltage on the valve control circuit is not within the expected range or if the fan speed is less than a calibrated value.

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Based on that definition (sorry for the headache) I first have to ask if the check engine light has turned on? Next, I attached a pic below. Make sure the connection is tight, clean, and not damaged in any way.

Let me know.
Joe

Hi,

Jason, did the original clutch do the same thing? Is that why it was replaced? Also, it is most common for them to engage when not moving.

Let me know.
Joe