What Else Causes a Blocked Air Conditioning Evaporator Coil?
Air Conditioner Evaporator Coil Frost or Ice Formation: When the coil becomes sufficiently blocked with debris as to slow down the air flow enough, the coil may actually become so cold that the condensate forming on its surface freezes, completely blocking the coil. That’s because the rate of release of refrigerant into the evaporator coil was designed with an assumption of a sufficient volume of air moving across the coil to keep it from becoming too cold. When the surface temperature of an air conditioning cooling coil drops below 32 degF or 0 degC, condensate forming on the coil surface begins to freeze, leading to sometimes some pretty weird behavior of the cooling system as we discuss at FROST BUILD-UP where we explain that there can be more than one reason that a cooling coil ices-up but none of those conditions is desirable. Damaged air conditioner coil fins: can occur on both the evaporator (cooling) coil and the outside condensing coil. See CONDENSING COIL FINS, SUPPORT PADS f
