It may be a stupid question - but have you tried it in auto?
The selection you have there should provide air to the windows and thru outlets in the dash/centre console and rear door pillars so, with the fan showing max, you SHOULD be getting air out at fair rate. According to the manual, those controls can be operated separately or in combination.
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2002 D2 S8 – Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18” Avus, ski hatch, Bose, auto dim rear view mirror, rear blind.
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