ok, so it took me a while to get back to this. Life gets in the way of non-essential old truck fixes.
Review: I'm trying to get my rear AC to run on high. Low and Medium settings work just fine.
I popped of the rear AC housing. I looked at the resistor, as suggested by LockDoc. A rough glance, I don't see any obvious failures. Here are a couple pics:
and a short video:
https://youtu.be/PXq9Dhlf2ZY
The resistor has labeled INDAK 392905
1. I see available resistors for sale labeled INDAK 392905
5. I wonder if they are the same, or close enough.
Anyone have any ideas what to try next? Is my relay perhaps located somewhere else? Generally the relay should be near the thing it controls, so I would guess it's nearby. I didn't take apart the motor housing...perhaps it's in there?