Hi, I'm new to the Alhambra, my 03 plate alhambra se has just developed a fault, there is very little air flow coming from any of the vents, I've replaced the red resistor, and replaced the pollen filter, I've taken out the actual heater blower and it is working on all 7 speeds (climatronic model controls) and still there's low air flow??? I'm thinking possibly the vent control flap could be the problem?? But I haven't a clue as to where this is located.....

Any help would be very much appreciated