If you want air to all areas you need all three direction lights on on the flow switch Tony. Also have you seen the thumb dial below the red emergency indicator triangle? That needs to be over to the red. Are your side vents dials open? If you travel alone have you turned the passenger vent dials off? With the top down I have just the one centre right vent open directed at my left hand, the vent to the right of the steering wheel the same thing, the direction flow has the bottom and centre lights on, the central thumb dial over to hot, it's utterly toasting, too hot actually so I vary the hand thumb dials to approx half open.
Hope that is of some use.