Here is the thread for future searchers, looks like it would be more trouble than it is worth.
My two cents: I've had a '94 and now have a 40th Anniversary. The Auto function sucks.
I found it MUCH easier to regulate temperature with my old A/C set-up. Even with Auto off on this new unit, the fan will change speeds when I change my temperature, will switch to recirc depending on where I put the temp or which designation I use (defrost, feet, etc.). It's like a freaking rubik's cube sometimes.
I wouldn't go to the trouble. I doubt you'd be satisfied.
I agree. I've got both, and I prefer the manual slide switch to the automatic feature. The automatic rarely gives you what you really want on a consistent basis.
Supposedly, the newest lexus has this fixed, with a new system that actually detects your skin temperature and adjusts accordingly. I'm sure that will be a hoot...