Have the MOT tomorrow, going to ask him about it again then, see if he can look into it there and then/another day.
Does the water pump help to supply cold air to the fans? I'm having a problem with my fans too; always blowing hot air, even when they are switched off. Although I suppose that could be many different factors - things blocking the fans, leaks, etc.
Okay, checked it. However, there was a slight problem - I had turned the engine off, then back on again once I'd lifted the bonnet, and the hissing sound had gone. In it's place, there was this whirring noise, sort of like grinding. I've noticed this before, too, how this only happens when you turn the engine on. After driving for a bit, then the hissing noise sounds, even in neutral. The grinding/whirring sound only happens when the car is first turned on, although stays on until I actually start driving.
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