I didn't realize this problem is so common in cars, and I've been putting up with it for two weeks.
The switch has four speed settings; nothing happens until High is selected.
In the course of troubleshooting, I erroneously decided the switch was at fault using a multimeter, and found a replacement at the local Napa store for $20.
You can already guess: the problem persists with the new switch. That pretty much narrows the search down to the blower motor resistor; but, finding it has been a challenge.
I introduced the problem at iRV2 last night, and a fine guy immediately proposed l look atop the plenum, sent a photo.
Well, Beaver owners, there is a challenge here: our Canadian friends have wedged the connector against the underside of the dash. Then, to compound the difficulty, someone has encased my resistor pack in a huge mass of expanding foam.
Has anyone done this procedure? Any tips?
As the repair progresses, I'll post news so that future owners can be spared the spooling up I've endured...
The AC unit was made by Specific Climate Systems of Fort Worth, amazingly. Not fifteen miles away, as the crow flies. However, they have apparently gone out of business.