Recently bought 2003 Fleetwood Fiesta. Seems to be in great shape. Getting ready for drive to Alaska next summer. Can't figure out why dash AC/heat only blows at max. Replaced blower resistor, but no change. Took dash control out and looked it over but can't see any problem. Then noticed that blower blows even with resistor unit completely removed. This tells me that the dash fan control isn't even wired to resistor. Any thoughts?