We are talking about the front footwells here ??
So the face vents , screen, end of dash vents are blowing hot and all good , this proves matrix is flowing and exchanging heat .
When the direction is at floor position is there air flow present but it is cold or no air flow at all .
If it is blowing but cold air it must be some kind of blend flap that is in the wrong position for when its in floor position .
Can you do the full hvac test with vcds that runs all blend motors and positioning flaps through there full working travel see if anything flags up then .
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