What would cause my A/C to ice up?

Answer by  Yaz (10)

Restricted air flow can surely be the problem. It is the moving air that provides the heat to keep the coils from freezing. When the filter and/or the pipes is covered by dust, the temperature will goes low and ice up. Or you is had the thermostat set two low.

Answer by  dponline (35)

Icing of A/C systems occurs when the evaporator temperature is smaller than 0°C. A root cause for this issue could be an incorrect setting of your expansion valve or compressor.

Answer by  jbuhr06 (126)

Your A/C lines and unit will ice up if the coolant line is not properly insulated. Moisture will seep through cracks in the insulation and freeze on contact.