hi all.
My 97' cab has a peculiar problem.
I can't get any air to come out of the centre vents and side vents only have minimal airflow.
When the airflow dial is set to vent, I still have the same amount of air coming from the foot vents, as though I hadn't moved the dial.
I've stripped down as far as i can without removing the dashboard, but can see nothing obvious.
All cables are attached, and they do move when i turn the dial, but the airflow won't come out of the centre vents.
I notice that the air flow dial won't go all the way around to vent.
Feels like a cable is not extending properly?
It's particularly annoying, because I like cool air on my face....
Can anyone help?

Ian