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What is THAT noise? W203 C200K Coupe.

Discussion in 'Electronics' started by Darzet, Mar 20, 2014.

  1. Darzet

    Darzet New Member

    Jun 29, 2013
    Sunny Poole, Dorset
    W203 C200K Coupe
    Last night turned on ignition and moved off and could hear what can only describe as a TOCK every second. Almost like your grandfather clock in the hall.
    Sounded like coming from behind the middle of the dash and maybe something to do with the vents - tapping the central vents with your knuckles make a similar noise.
    Eventually went away after about a minute I would guess, and did the same this morning when I started up then went away after a short while. No warning lights on dash, but bleedin annoying and maybe expensive to fix?

    What is it? I'm thinking it's related to the aircon /ventilation system?

  2. AndyPCD

    AndyPCD Registered User

    Jul 19, 2009
    C250 cdi amg sport plus
    It will be one of the stepper motors for the flaps in the heater box

    Its quite a common problem on the car. Will need plugging into star machine to determine which one its is.

    Some are easier than others to change. Some only need a few dash trims removed to gain access while others require the whole dash being removed.

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