Michael L Dayton , NV May 16, 2020 Appliance: Maytag Refrigerator MFF2557HEW Maytag Refrigerator Mff2557hew: Refrigerator not cooling properly. How to replace Thermistor Kit. By using your repair videos and troubleshooting suggestions I was able to determine the problem and order the correct replacement parts. I really appreciated your next day delivery of parts, problem was solved in 24 hours! You folks are the best! Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes