I gave my little brother an air conditioner that is only a year old to put in his apartment. He said that he put it in his bedroom and plugged it in. He turned the air conditioner on to "turbo" cool and left it on all night. When he woke up, the next morning it was making a running noise with hardly any air coming out (not cold air) and was also making an intermittent clicking noise. He said this is exactly what happened with the previous air conditioner that he had in his bedroom window. What could be wrong with the air conditioner?