A mechanic told me that the thermostat is leaking, what I have noticed is that the water is always hot on the car and needs to be filled quite regularly so I assume that means that car is overheating? There is also a loud sound when I drive, as if the fan isn’t working or something. The spanner light also came on but the car was serviced in Aug 2021 so it’s not for service, I think the leak will eventually affect the engine.