I had a similar issue with my chevy truck (I know its not a rover), only seemed to out the vent, anywhere else just seemed to blow in the dash. It turned out the control module went bad. It was a factory warranty fix so not really sure the procedure or cost. Most likely very expensive since yours is a rover.
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'60 Series II 88 
'04 Silverado 2500 4x4
'02 Altima 2.5 (Hurts less at the pump) 
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