Genuine Fujitsu 9372584279 Indoor Evaporator Coil is the evaporator coil in the indoor unit, where refrigerant takes in or gives up heat as room air passes over it. A damaged or leaking coil cannot move heat, so the room is not heated or cooled and refrigerant can be lost. A genuine Fujitsu part is made to the same design as the original, so it goes back in the way the indoor unit was built.