AC evaporator ices up in Dallas area.

[Dick Keats]

De-iced three times so far today but it keeps freezing up after running a while. Filter and fins are clean. I can see the water running. The fan motor sounds good when running and cold air blows through the vents. Do I need Freon? Or something else?? Thanks in advance for your help. Dick in Ferris, TX

[Ralph Mowery]

If you have plenty of air flow, usually the ice means low Freon (refrigerant).

Funny how low refrigerant causes the icing,but it will.