Rob W Mountain View , CA March 21, 2016 Appliance: Model AMANA SGD22TW Bottom of freezer cold but top and refrigerator not cold Removed bottom half of covers in back of freezer compartment. Coils frozen on top half and around evap fan. Defrost thermostat bulged and probably the problem. Melted ice with hair dryer. Had already ordered defrost timer and thermostat from A.P.P. regular shipping, received in less than two days. Replaced both, everything is working well. 8 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 2+ hours