Sounds like it could be one of you HVAC systems vent doors. Our cars have several different doors all controlled by motors. One is the air mix door which is found attached to the side of the heater unit for the drivers side and the passenger side is attached to the doorsill under the dash behind the blower motor assembly. The next is the intake door motor attached to the blower assembly found under the dash of the passenger side. There are two air mode motors one attached to the heater core controlling the drivers side air flow another attached to the side doorsill but is only visible with the blower assembly removed, controlling the passenger side. The final unit is also attached to the heater assembly and controls the single upper vent door. Any one of these could be making this noise. Start by setting the temp on the drivers side to 18 listen for that sound this could be the front air mix on the drivers side. Next set the passenger side to 18. Then turn on and off the upper vent. And finally slowly cycle through the different modes. Hopefully this will narrow down which one is defective. Unfortunately any of the drivers side units are a PITA to remove.tomnan24 wrote:Thanks for your answers. However the noise comes from somewhere in the dash in front of the driver. It happens right before any movement of any of the memory items.