Well Berry, you seem to have called it. The service manager came out to meet me and review my issues. As soon as I mentioned the fan speed issues he pulled out a service note from Ford advising them to check the grounds on the "heater blower control module" and if they looked good to replace the module. He told me that this module controls a lot of what goes on with the a/c system and that they have been problematic. They had the part on hand and changed it out in about 10 minutes. He then asked me to drive the truck for the weekend and let him know if it helped the situation.

The part is a little black box with metal fins and looks like it installs into the ductwork itself. Perhaps it senses temperature?

For those of you experiencing erratic fan issues, know that there is a service instruction out there that makes no mention of cell phone chargers.

I'll let everyone know what happens.