Clicking Noise From Behind Center of Dash on Mercedes-Benz CLK500

Problem Description and Possible Solution

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.

Problem Data
RepairPal Verified
Average mileage: 84,987 (700–147,978)
4 model years affected: 2003, 2004, 2005, 2006
42 people reported this problem
Viewing 1 - 18 of 18 comments
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.
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.
same problem i have 2004 clk 500 and the noise behind the dash continues even with car completely shut off and my a/c blows cold but doesnt blow like it should like as if it was blocked.???
Intermittent Clicking Noise Coming from behind center of dash when starting engine or as Key is pulled out of ignition.
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.
Clicking noise behind dashboard after starting the engine, it eventually goes away after the car warms up less between 1-3 miles of driving.
Day after I drove it off the lot, the clicking started behind the dash. Trying to work with the dealer to see if they will fix since it happened so quickly (it wasn't there on the test drive). I haven't had it priced out yet but it sounds like taking the dash apart to fix it can't be cheap.
I have the same "clicking" noise when I start my car (CLK 320, 2004). This noise, in addition to the recent radio problem (static of stations all of a sudden and CD changer deciding not to work) are enough to make me crazy!
I have yet to take it to the authorized dealership where I purchased the vehicle due to the amount of $$ I'm sure it is going to cost. :(
I was advised not to try to pull the dash apart to fix this, after a few months it went away, or sometimes still heard but very quietly and short lived.
loud clicking noise for about 3 minutes on car start up and the passenger side is usually what it affects.