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Yup, And let me tell you the aftermarkets and the OE are NOT identical! Kind of ticks me off. I'm sure that going from copper to aluminum they probably had to be changed a little to keep them strong but gee. The one I used the issue was that it's width was a tiny bit narrower so I had to seal that space off so it would work correctly.
Well, I did mark everything and put it back as it was. However, I did not check function before disassembly because the control head was out and had not been replaced. I installed the new one during reassembly. Fan didn't kick on very strong either, I have to diagnose that still. Hot cold slider works great and I can hear the door reposition. The vacuum actuated door shown moves full swing in only one direction, inward.
We I hope someone better with blend doors than me chimes in. One of the problem is blend door issues are so rare on these trucks I haven't had to do much. Like I said if it was in front of me I'd fart around with it until it was right, but it's hard for me to advise you. What I can advise you on is the fan. low, low-med, med-hi, all have small changes in speed between them, and then hi is much higher than med-hi that's totally normal. If your not getting good air flow on any position, at any speed then I'd replace the fan, often times they just don't turn as fast after all these years.
Have been unable to locate on LMC. I found the OE part number 15-71220 but no one has it.
