Probably the blend flap servo. See what we have written here:
Blend Motor Diagnosis and Replacement
I have no idea what a dividing vain/vane is - unless they meant a distribution flap servo. If so, they are wrong (although one might as well replace it whilst doing the temperature control blend flap servo as they come as a set of three). The distribution flap directs air to the floor/windscreen/face vents, etc.




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Brilliant, exactly the info i was after...
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