-Loose, displayed or stretched fan belt – commonly causes a squealing noise
-Refrigerant gets low or runs out – results in the air not being cold (often referred to as needing a ‘regas’)
-Electrical problems, particularly with the fan, evaporator and condenser – can cause a range of problems including the air conditioner not working at all
-Evaporator drain becomes blocked – water can sit in the drain and algae can grow which causes bad smells in the car
Some problems can be fixed relatively easily, such as refitting the fan belt or regassing the refrigerant. Other problems require some more time consuming repairs and/or replacement of broken and faulty parts.