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Dash Clicking

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I have a 2001 GS 430 that has the classic "dash clicking" coming from the center of the dash. It does respond to setting the passenger side to max temperature to stop the clicking...but under dual mode and normal operation...there is an irritating "center of dash" clicking going on. It does stop at times (usually after several minutes). Reading these appears to be one of : 1) AC directional damper motor, or 2) Servo Motor in dual climate control, or 3) AC solenoid. Other thoughts of others: 1) Clean the Cabin Temp Sensor, 2) problem with air mix servo (mode servo). What is the most likely problem here??

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