It's pretty hot in England too right now! But I've been to Malta once in early May and the other time in early November and at both times the daytime temperature was in the upper 20s, so I can imagine what it must be like at the moment.
Anyway, I'm not posting simply to discuss the weather! My A/C sytem isn't working properly either. When I put it on Auto and then set the temperature to "Lo", it sets the fan going at top speed, as though to cool down the passenger cabin. But the air coming out never really gets cool. Is this the same problem as you're having?
I'd be very grateful if someone could shed some light on this. Thanks in anticipation.