Bravo '51 radiator fan on all the time. Disconnected earth to stop this. Previously fan not kicking in at all and replaced the sensor unit, thermostat and water pump. Then connected directly to the battery and it worked. But now on all the time. Is this a prob with the ECU only? (fan cut-off function?). Previously had a front impact and may have shorted switch function on ECU - is that feasable? Am located Bedworth (CV12) Any one recommend a garage if all else fails.

Hiya Steven and welcome to the forum. I've asked for this to be moved to the Bravo/a section, hopefully we can help you more down there

the ecu switches the fan on by giving it an earth. the ecu decides when to do this using the coolant temp sensor signal (sensor fitted to thermostat). if the senso rif faulty then the fan is switched on constantly. your coolant temp sensor coudl be faulty, or disconnected, or its connector/wiring could be damaged.

failing that, it is also possible (and common) that the relay pins/connector on front of the battery tray have corroded so that the fan is given an earth constantly.