Hi to everyone , this is my first post , i have a 2 ton split a/c system R22 ,the air handler is bryant about 7 years old and the condensing unit is a goodman 1 yr old ,the air handler is a closet unit (front coil) piston's coil , now the thing is , the system got frozen every two week , not every day , the freon level is good , the air filter's coil is clean ( i washed) , i replace the fan motor ,the capacitor and the control board at the air handler , i replaced the thermostat as well , when the unit got frozen ,the fan motor still running , i taped all the insulation behind the door of the air handler , but the system still freezing up an average of twice at month , anybody has idea what is going on in this case ?? thank you in advance !!!