TimC

Mine is a 2006 , which seems to have many similarities with the 2009 version. Anyway turns out the fan controller mounted on the rad is faulty according to my local independent experts. New one ordered so we'll soon see.

Yes it's a 1.4 8 valve petrol version. However, I can only find 1 sensor on the cylinder head at the gearbox end strangely which differs from what you (and others) say & the Haynes manual. There is no temperature gauge on the display, it's a Desire version. The engine fuse box layout is different from that in the handbook but I managed to get the correct layout from the Citroen service website. At the moment I'm confused but am taking to an independent Citroen specialist tomorrow so we'll see.

My wife's C3 is overheating with the radiator fan never kicking in. I've connected a Foxwell NT200 and there are no fault codes present. Letting the engine idle and watching the engine temp rise - via the Foxwell - I see that when it reaches 90C the thermostat must be opening as the temp then drops down. On further idling it slowly rises to 101C & beyond with no sign of the rad fan starting. If I turn on the A/C the radiator fan immediately kicks in & the temp drops accordingly. This I believe is correct . I know there are 2 sensors for the coolant system & obviously the one for the coolant temp is fine, not sure about the other one or exactly what triggers the rad fan. The radiator is getting very hot so water is circulating to it OK. Any guidance would be much appreciated.