A repetitive clicking noise from behind the center area of the dash panel is usually caused by a broken stepper motor actuating arm. The actuating arm controls the direction of air flow in the climate control system. Disassembly of the center console will be required to access and change the broken arm with the updated, reinforced part.Google+
Car Problem Reports
Mercedes-Benz CLK500 Broken Stepper Motor Actuating Arm May Cause Clicking Noise From Behind Dash
Mercedes-Benz CLK500 Problem
Average Mileage: 84,076 mi (42,000 mi - 128,000 mi)
Under the driver side a damper flaper snper 5x after every start up. After removeing the under dash cover I could see everything. It looks as if a motor or a arm is not moveing the way it should. This is not fixed,can anyone help.
Visitor, 2004 Mercedes-Benz CLK500, 128,000 mi
clicking behind the dash on start up, clicks 5 times, then repeats for a minute or two before it stops completely. this happens every time I start the car.
Visitor, 2004 Mercedes-Benz CLK500, 110,000 mi
loud squeaking noise when starting the car cold
Visitor, 2003 Mercedes-Benz CLK500, 98,000 mi
loud clicking noise for about 3 minutes on car start up and the passenger side is usually what it affects.
Visitor, 2003 Mercedes-Benz CLK500, 62,000 mi
Upon starting my ignition, I hear a clicking sound from the middle of the dash board
Clicking noise that seems to be coming from the center of the dashboard, upon start up. After a few minutes the noise disappears. My Service Advisor mentioned that it is coming from the AC/Heater system, flapper. In time, the noise has disapated
There has been no effect on the performance of the system. At 115,000 miles, I'm getting another noise that also sounds like rapping from the front dashboard. You get to live with it.