First up, it has been years since I replaced blend motors in a P38, so please don't take what I say as gospel. Also, I think I only ever did two (a friend's and mine) and assisted in a third. Others here will have better knowledge (and memories!).
You don't have to pull the whole dash apart, but you do have to be prepared to cut and refix the plastic air ducts in order to easily access the right hand motor. This sounds drastic, but is really quite easy as you can tape them back together with any decent fabric tape so they're as good as new.
From memory, the left hand motor is easily accessed by removing the passenger airbag. I forget about the central one, but I think it's behind the radio somewhere and is also straight forward to access.
The blend motors (which are all identical) come wired together in a set of three. But you often only need one of them and anyway it can be easier to cut the wires and re-solder them as replacing the loom probably requires removing even more of the dash.
But the good news is that once you can physically see them, you can easily check to see if they're working by running the HEVAC system through it's range. You will readily see which motor is not moving it's lever through the full range.
I have one new blend motor for sale in the engine ancillary section.
2013 D4 expedition equipped
1966 Army workshop trailer
(previously SII 2.25 swb, SIII 2.25 swb & lwb, P38 Vogue, 1993 LSE 3.9V8 then HS2.8)
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