I have a Smart ForTwo CDI, and intermittently getting what sounds like a fan coming on quite loud behind the dashboard. It is not the heater fan or air con. No warning lights or loss of power, although that issue we have as well, like a lot of other CDI owners apparently. Anyway, my girlfriend drove 10 miles and each time she stopped at lights the sound went off. Started again when she set off. What on earth is this? I didnt think there was anything to do with the engine at the front. Is it some kind of cooling fan? Its only happened a couple of times since we got the car 2 yrs ago. Engine revs dont increase while its doing it, and its not the dpf being cleaned, as we know when it does that. Can anybody help? Dont want a silly priced Merc assessment

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