William S Supply , NC May 05, 2020 W e have a top freezer in our frig was not freezing I ordered a temp sensor that controls the defrosts the evaporator. I used a quarter-inch socket and ratchet plus Philips screwdriver. I had used my wife's hair blow dryer to defrost the evaporator coil, after all, it took me about an hour to complete. Read More... Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes Tools: Socket Set