99 S320 Air Conditioning issues

Hi all,
I have recently bought this beast and although the air con works when the car is stationary, once I start the car moving the vents seem to shut off!
The center console vents close completely when the setting on the dial is auto. The side vents seem to let air in from outside, but not from the engine, for example; the air con is on but the heat/cold air is whatever is outside. Also if the air con setting is on auto, then the fans do not increase to try to get the temp requested?
any ideas please?
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This requires multiple points of diagnostic. When you said center air flow shuts off... was that during acceleration? What about constant coasting?
If you manually set fan higher, will it go higher?
Sounds like you have a vacuum problem only on your AC system... most likely the yellow checkvalve is bad... located inside the engine compartment... usually by the fusebox location. You may have one or two of them.
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