If you’ve owned an air conditioner, you’ve probably, at one time or another, had it turn into a giant ice cube and stop cooling. To help you with an issue like this, here are the most common causes and recommendations.

Lack of AC Airflow

Dirty Air Conditioner Filter– Most common cause is simply a dirty filter. Just change it out with a new one and continue doing this about every 30 days. This will happen when you forget to change your filter for a few months (or more).

Dirty Air Conditioner Evaporator Coil– If you look back on previous posts you’ll see pictures of dirty evaporator coils. As you can see, this greatly prevents airflow and will also cause your system to freeze. Get on our maintenance program to make sure this doesn’t happen.

Air Conditioner Low on Refrigerant

Your air conditioner is a closed system and will never run out of refrigerant (in a perfect world). Due to age, lack of maintenance, defects, etc an air conditioner can form leaks. A lack of refrigerant causes low pressures, which results in low temperatures, and therefore ice build up. As mentioned before, get on a maintenance plan to identify leaks early and avoid the hot day surprise of no heat and ice build up on your AC.



AC Blower Motor Not Functioning

If no air is blowing over the evaporator coil, it will freeze. 

Once your AC turns on you typically will hear a motor turn on and feel air coming out of your vents. If the air conditioner blower motor is not working your AC will turn on, but no air will come out of the vents. This can be caused by a tripped circuit breaker, bad blower motor, bad capacitor, etc. First option would be to check the circuit breaker for the blower motor. If tripped, try resetting once (only once). If it starts, then you’re good.


These are a couple examples of what may cause your AC to freeze up. Although not totally comprehensive, these are the most common causes. As always, don’t ever take apart your AC or begin working on it…contact a trained technician to perform any work to avoid harm to yourself or your unit. Also, best way to avoid the common issue of your system freezing is to get on a maintenance plan. If you haven’t already done this…do it today. It’s a very small investment, but huge overall savings, comfort, and life to your AC unit.

If you are looking for Air Conditioning Service in Dothan, AL contact Long Heating and Cooling at 334-790-0977