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That is one trick looking piece of kit there Adam! It almost certainly is for your radiator fan. How it works is beyond me however. You could try talking to someone from peugeot or citroen but i doubt they'd tell you anything. I doubt even the mechanics know how it works, only if it does or not! If it's sending an analogue signal to the ecu, as you imply, then hooking it up to an LED etc. is going to be more difficult. Well for me anyway....! But if it switches on at a given temp then you are in luck. All you need is a circuit diagram...........
ollie
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