Greg H Elmhurst , IL January 08, 2018 Appliance: Maytag Refrigerator MBF1956KEQ11 Maytag Refrigerator Mbf1956keq11: Freezer was cold refrigerator was warm evap coils were all frosted up. How to replace Defrost Heater Assembly. FREEZER ON BOTTOM. TOOK OUT DRAWERS AND BACK PANEL. USED A HAIR DRYER TO DEFROST COILS THEN PUT IN A NEW HEATER, DEFROST & DEFROST THERMOSTAT. I FIGURED THEY WORK TOGETHER AND HAD THE SAME WEAR PLUS WAS EASIER TO DO AT ONE TIME. 2 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes