I've had no book symbol up for a month or two now after changing the pot on the rhs blend. Last two mornings have flagged the book up after the self test and it defaults to screen only which makes sense from a safety point I guess, I cannot change air direction.
However, after the brief journey to work and starting her up again a few hours later when coming home....no book symbol and everything is well again.
Why would a fault exist first start every morning but not on the 2nd ,3rd,4th etc of that day? Ambient temp is fairly constant so heater box 'tightness' being my first thought, seems unlikely.
It sounds like the grease on the pivots is starting to get a bit sticky. So it fails on initial start up when everything is cold but moves freely enough once the heater box has warmed up. I've found silicone oil to be the best for both softening the old grease and lubricating everything.
I did spray the blend motor pivots when I had that out with silicon spray. Never had the distribution motor out, its always the rhs blend that's given me trouble. I'll pull it to bits when I've more time and lube it up, ta.
Have a look at the pictures in this thread https://rangerovers.pub/topic/3864-no-blower-air-to-windscreen, unlike the temperature blend motors which only move one flap, the distribution motor is moving 3 so there's more bits that need lubrication.
That's very useful Ta.