My GE side by side model #GSH22JGCB CC. The water dispenser line keeps freezing. I bought the syringe and tube to defrost it with hot water and it works for about a day the it freezes up again. I was told that there might be a heat kit to install, is there and do they work? Also was told it is because there is not enough insulation around the line. Is there a way to separate the door and put insulation around it, maybe spray foam? Thank you