Car Problem Reports

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

Mercedes-Benz C240 Problem
71 Reports
Me Too

Model Years Affected: 2001, 2002, 2003, 2004, 2005

Average Mileage: 103,829 mi (27,000 mi - 255,783 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, , 76,000 mi

    clicking noise under the center of the dash upon starting the vehicle. Heater only blows at the windshield and never anywhere else no matter how I set the air flow controls.

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  • Visitor, , 140,000 mi

    recently began - hear the "clicking noise" upon startup for about 60 secs - seems to be from the AC/Heater so I turn it off and on. while the noise is "clicking" air flow is greatly impared. Not liking what I read here as sounds like it is going to be yet another expensive repair from what I though was a High Quality Automobile - Mecedes - NOT! just a very expensive automobile to maintain and OFTEN! very disappointed!

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  •  Rookie

    So, is it okay to drive the car if the Stepper Motor Actuating Arm is broken? I certainly would not want to further damamge the car. Just want to know how much time I have to get my monies together.

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  • Visitor, , 27,000 mi

    Clicking sound behind the dash. Clicks 8-9 times then stops. Dealer diagnosed as a $439 repair.

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  • Visitor, , 168,000 mi

    same clicking noise behind dashboard

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  • Visitor, , 74,000 mi

    Price of $1200.00 to fix and this prices not from the dealer.

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  • Visitor, , 60,000 mi

    broken stepper motor actuating arm

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  • Visitor, , 255,783 mi

    I have the exact same problem. At every start there is a ticking sound coming from behind the air vent and last for few minutes. Air conditioning has been effected since then.

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  • Visitor, , 60,000 mi

    As described by others, clicking noise heard when turning on Heat / AC. Sounds like flappers moving in vents as air flow changes between outlets. Usually stops after a few minutes. Quita annoying.

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  • problem continues, I cannot afford the repairs on this car anymore, there have been too many

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