Hi Kevin,
No, I can honestly say that this is the first time I've ever heard the two words 'blend' and 'door' used together a description of a car part. LOL. But I'll tell you what, I had the car repaired by some guys who specialize in Benz repair, not Land Rover. I had to tell them to replace the bolts on the intake manifold when they replaced the gasket. I did the research that they should have. So I have a suspicion that it may have something to do with their repair. I know they replaced the coolant, but they didn't replace the top hose clamp properly and I had a slow leak there until I replaced it myself. (they were probably in a hurry).

I saw someone had posted something about a 'flap' being stuck or jammed in relation to this sort of problem. Is that what you are speaking about? The point is, everything worked fine before I gave it to them, and now... so my first thought is that they might have done something inadvertently, to contribute to this issue.

Could that blend door motor be a 'fuse' that is blown?