Blower motor relay went bad
Went to fill the fresh water tank at a friends yesterday(we have well water). Not one minute after turning the a/c on the fan just stopped dead. Figured I blew the fuse, no luck fuse was good. Figured this was gonna be fun. Checked for power at the blower, none. Jumpered the blower to make sure it works when power is applied, yup works great. Checked the resistor pack, that's fine. The manual has all the fuses listed and 3 relays none of which were for the blower motor so I thought maybe there was no relay. Pulled the dash apart the check the fan switch and no power to the switch either so I figured there had to be a relay. Found 2 other relays under the hood on the driver's side. Voila first one was the right one, plug in a standby relay and the fan fired right up. At least it happened now and not when we were leaving for 2 weeks later this month.
I guess the moral is check fuse AND relay first before taking a bunch of other stuff apart.
Bob Kulhanek 1995, 29 ft, Coachman Leprechaun, Ford E-350, EFI 460, 4.0 Onan Gen
If it won't budge, hit it harder or get a bigger hammer.