I just had the sense to use a thermometer. Max fan to the windscreen vents, AC off, I read 16C (odd as it's 10C on my garden thermometer and 8C on my car's outside thermometer). Anyway, turn AC on, drops to 12C. Is a drop from 16C to 12C ok? I've heard that they have thermostats to stop it blowing freezing cold air. Maybe it'll still blow 12C when it's 25C outside? Anyone got readings they can compare this with from their own car?