Car Problem Reports

Mercedes-Benz C240 4MATIC Broken Stepper Motor Actuating Arm May Cause Clicking Noise From Behind Dash

Mercedes-Benz C240 4MATIC Problem
18 Reports
Me Too

Model Years Affected: 2003, 2004, 2005

Average Mileage: 97,672 mi (55,000 mi - 160,000 mi)


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.

  • Visitor, , 112,000 mi

    My 2003 C240 has the same broken stepper motor actuating arm. Since Mercedes has acknowledged the problem by creating an updated "stronger" part, will they replace it for free?

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  • Visitor, , 107,000 mi

    Clicking noise from behind the dash on my 2001 C240 when started. Lasts for about 15-30 seconds then stops

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  • Visitor, , 121,000 mi

    I have the same problem . . . a clicking sound. It lasts for 2 to 3 minutes every time I start the car. My car was in dealers to have the ME Control Unit replaced - and when I picked it up, it started clicking. The dealer claims that the two are not connected. In other words, they are saying that the broken stepper motor arm isn't their fault - that it's just another coincidence.

    Does anyone know if they are? I am so frustrated. It seems like one thing after another with this car.

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  •  Rookie

    I can see the airflow vent clicking if I hold a mirror to the dash and the front window defroster doesn't push air. Any idea what the cost is to fix this stepper motor actuating arm?

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  • Visitor, , 68,567 mi

    Same issue.

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  • Visitor, , 160,000 mi

    clicking noise behind dash

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  • Visitor, , 72,000 mi

    Repetitive clicking noise from behind the dash for about 30-45 sec. upon starting the car.

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  • Visitor, , 112,000 mi

    There is a clicking noise coming from the center of the dash board when I turn the air conditioner on. It is really load but goes away after a min. or so.

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