The battery is downloaded

How, I have a 2004 Renault Clio and it turns out that when the engine is extinguished, the fan continues and it goes out until the battery ends, since I try to turn it on again and no longer turns on, so I have to pass a battery, they will know that this is due and how could it fix it

Daniel In this case there may be several reason, one that the temperature sensor is damaged and therefore does not turn off the fan, another that the battery maintains a good voltage range but does not generate amperage and it may also be that you have a heating problem and the fan takes longer to cool with the engine off since this vehicle has that function, another thing is that they check you the resistance of the fan can be directly I attach an image of what I mean.