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car is 2008 and done 34,500. FSH. We have discovered that it is something to do with the cabin air vents (cooling system). When I turn the fans off using the switch on the dashboard, the noise goes away. I have to have everything off. I cant use airvent fans, air con etc. Don't think it is an air con noise because ive only used that once. It is always turned off. My husband seems to think it is something to do with the air induction? I don't know if this noise its making is normal or not. Ive listened to another smart fortwo owned by someone at work, and theirs doesn't seem to do it, but I don't know whether they had their fans working in the cabin or not. I didn't ask because I don't know her. Might try and catch her again. To describe the noise when sitting in the car:- the engine speeds up slightly then I hear a metallic "click" and the engine settles down again. It repeats this over and over again every15 seconds or so. This is at idling or doing slow manoeuvres. I cant hear it at speed. When standing outside the car:- I hear the same thing, but the click is a lot louder. I have noticed that when the engine has been running and got up to temperature, the clicking isn't quite as loud. I think I will have to take it to a smart dealer and see if this noise is "normal". If it is, then I don't think I want to live with it. Idont think you can help me further without actually seeing and hearing the car but thanks anyway