Heater blowing up fuses = no heat

[Sunshine41]

Hi.. I have a 2014 Rogue that has been giving me nightmares lately. The heater keeps blowing up fuses. We brought it to the dealer 4 times already. They are at a lost and don't know what else to do. They've changed the blower, the knobs, the whole section that makes up the heater unit, and the controllers. They've had it for weeks at a time to try to figure out what could be wrong. Every time they think they've solved the problem, I get in to my car, the heater will work for a while, then all of a sudden, it blows up the fuse again and I have no heat. It's completely dead. Did anyone ever had the same issue or would someone know what is wrong? I love my Nissan, but I have to say that I'm starting to love it it less and less. Help! Thanks.