Man L Brooklyn , NY February 15, 2020 Appliance: Whirlpool Refrigerator WRT351SFYW00 Whirlpool Refrigerator Wrt351sfyw00: Temperature problem. How to replace Thermostat (Bimetal). I changed the thermostat and it took me about 20 minutes. It is back to normal. 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes