I see that this is a pretty old conversation, but I just bought a used 2018 Interstate, and the bathroom exhaust fan wasn't working. The foam had come loose and was tangled up in the fan blades. I climbed up to the roof and extracted the foam, but the fan still didn't work. I disassembled things from below and found a thermal fuse taped to the side of the fan motor. The switch and motor tested good, but the thermal fuse was bad/blown. I've ordered a new thermal fuse ($7 for a pack of 5) and expect that to fix the problem... unless the motor is semi-bad and overheating. I'm hopeful that it just overheated once - when it got tangled up with the foam - and that this single overheating event did no significant permanent damage to the motor.
Eric
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