what causes a central ac unit to freeze
1 Mechanical failures can cause your air conditioner to freeze up. 2  If there is a kink in your refrigerant lines, a blower fan that is not running or is dinged and out of balance, or a clogged filter dryer, then this too will change the pressures in your system and can make your central air conditioner freeze up., you can figure out why your central air conditioner is icing up. Your air conditioner can freeze up for a variety of reasons, so we will discuss them from the most common to some of the more rare causes of ice up.