Glenn F Wentworth , NH January 06, 2019 Appliance: Frigidaire Frg(V6) / Top Mount Refrigerator MRT18FNEW0 Frigidaire Refrigerator Mrt18fnew0: Freezer cold but frig warm. How to replace Defrost Timer. Replaced defrost heater,thermostat and timer. Also replaced run capacitor just because it was not expensive and did not know how old it was. This is a 22 year old white-westinghouse model frig but compressor and freon seem ok, so did not want to buy a new one yet. Hardest part was taking my time to disassemble everything as the on line videos are all for newer models. Everything seems to be working good now but time will tell. I may change out the temperature controller and fan motor in a month or so if everything stays running good. 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours