I get a clicking sound in my vents no matter what setting I put the air control on. If I turn it completely off it stops, but otherwise it continues to click, and it does not happen constantly, however it happens more often when it's cold. Any solutions? The dealer I took it too when it was still in warranty checked it out at least 3 times with no solution.
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The clicking is caused from a blend door motor not working properly. This motor moves a door in the heater box to control airflow. There may be 2-3 motors in the heating/AC system and one of them is causing the problem and will have to be changed
It sounds like vacuum is not getting to the vent, heat and A/C controls. Find the vacuum can. It may be under the hood on one of the inner fenders. The "one-way" check valve is usually located in the line and close to the can, make sure it works properly. The valve could be the very thing that's causing the problem. Trace the lines back to the vacuum block at the intake manifold or fire-wall, and also back to where the line goes thru the fire-wall. Check the can for leaks or obvious holes. They used to be just a plain metal can, but it could be a plastic ball. Check the lines as you go, for breaks and rub-thru's. Move the controls thru all settings and listen for vent door movement. Worst case is a bad vacuum motor or air flow position selector switch, and/or a faulty Blend Door Actuator. If you have been driving around with the Temperature knob or control set at the same spot for months, move it from fully cold to fully hot several times and wait for the air temperature to change each time. This will help reset the blend door and vacuum control system. Hope this helps... Let me know what you find.