I could not understand why many talk about fuse. Fuse purpose is to blow and cut off power when there is fault in device it is powering like fan, radio, etc. Once blown, it needs to be replaced.

The relay is the correct suspected component since its job is to switch on and off. If relay stuck, it cannot switch off. I do not own Saga but on most car with electric fan to cool the radiator, once the engine is turned off, there is sensor on the engine part that send signal to the relay. If the sensor detect the engine is still hot, it will keep the relay on. When the engine has cool down to certain level, the sensor will send signal to relay to power off the fan.

So, if the relay is okay, I would check if the sensor is functioning properly or not. This is what I can advise. Ask the car electrician if there is such sensor as I'm not Saga expert

I think I misunderstood DonMe. He was talking about the Fuse Box problem, not the fuse itself