Robert R Asheville , NC March 11, 2015 Appliance: Whirlpool Refrigerator GX5FHTXVY08 Whirlpool Refrigerator Gx5fhtxvy08: Malfunctioning defrost heater. How to replace Refrigerator Defrost Heater Assembly. Total repair took slightly over 1 hour. Would have taken longer had I not already have taken the freezer apart on a previous occasion. Therefore I already knew the sequence and was able to disassemble it quickly. A little tricky getting the part out but easier to get it in. SImple repair for anyone mechanically inclined. 8 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours