I had problems with the fiesta overheating even though temp gauge says normal temp on dashboard. After box ticking all the usual culprits (relays, fuses, isolating fan to test it works which it does etc) found out it's the ECU ignoring any messages from the temperature sensor. Decided to bypass the ECU by cutting through the top radiator hose and fitting an aftermarket inline sensor adapter and temperature gauge with sensor. Has anybody fitted one of these so that it works the aftermarket gauge as well as kicking the fan in when the engine starts to overheat. Please could you give me some advice as there are no instructions or wiring diagrams and electrics aren't my thing or if anyone knows of any YouTube videos that are actually useful that would also be appreciated. Thanks.