Eileen L Elmhurst , IL May 17, 2015 Appliance: Model KITCHENAID 42" BUILT IN Freezer too cold Changed out the Bimeti - Def, or defrost thermostat. Super easy repair, took about 20 minutes total. So far it seems to have fixed it. Fingers crossed! Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes