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if it is the fan inside the Ridgeline I would first look at whether or not the blower motor recall was done. I would think it has though since you mentioned you have been to the dealer with it before and they should be checking for recalls any time you visit them for service.
If you do not find a fuse blown and it does not blow air at any speed I would assume the blower motor transistor has failed. If the blower motor is drawing too much power it may have caused the blower transistor to fail. The blower transistor is under the dash on the passenger side and is easy to replace. it is only held in by a couple screws.
If you are a handy and have a ohm meter there is a test for the the blower transistor I can and post for you.
You are welcome I do know that the blower transistor is a common item that fails.
If you want it here is the diagnoses for it in an .xps file. I can do a pdf at home later if needed. https://www.dropbox.com/s/1xheevl8x4piu08/blower%20trans.xps?dl=0