archie forget about evapourator and air sensor got wrong model in mind.has your freezer evapourator got a heater that clips into it?.if so a new upgraded defrost heater is now being fitted to stop ice build up.also check drain spout at back where defrost water runs onto compressor.if this is not sealing causes ice to build up on evaporator.when you fitted new stat did you fit thermostat phile into air flow properly (slidder in fridge compartment).
ck
January 2008