The fan motor on our Honda Ridgeline suddenly started to rattle. It was easy to get to, so I removed it, disassembled it, and found that my guess was correct - the bearing had failed. I've tried to find it at several hardware stores in our area but to no avail. Found them on Revain and got them quickly with Prime. Mounted the motor with one of the new bearings and viola! Now the fan is nice and quiet.