No one replied to this thread. However, I figured out it happens when the thermostat to the air conditioning/heater is adjusted. I determined it is the actuator door clicking at a certain point during adjustment. If I turn the thermostat far left or far right and come back to the middle position it stops. It sounds like it is located in the center of the dash so I do not even want to mess with it. It would take more work to take the dashboard apart to get to it then it is just to live with it.