Clicking Sound Under Dash

Really need to determine what is causing the noise, because it may be a real problem. Then you can decide if you want to remove the component. See if it changes when you turn your A/C system from the panel setting to the floor etc, it may be a defective A/C door motor.

Move the air from hot to cold see if it makes the noise. Might be the plastic gears of the blend door motor. I Hope not because that takes a good bit of labor to do that job.