Jo Mc, If you are still having problems with the engine overheating replace the radiator fan resistors. Only about £13 from Citroen. They sit in the front side of the radiator cowling, drivers side. Changed mine and works properly now.
Jo Mc, First check if the radiator is getting hot, if not then check the thermostat is opening, the fan will not work unless the radiator gets hot to operate the radiator fan switch.
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