Thought I'd attack the drivers side blend motor again, don't have the courage to look at the passenger side yet.
It's still not happy but not giving any fault code either! Ignition on it cycles fully cold to fully hot, then refuses to budge until i turn the ignition off and back on at which point out repeats the cold/hot cycle. Calibration maybe?
If it was getting an unexpected reading from the pot, surely I'd get a fault code?
I'm getting codes for the passenger one but I've not started to look at that yet
The gears are fine, the motor seems fine in both directions and the pot gives sensible readings