The hissing from center vents on a W210 usually means it is low on refridgerant.
Why not get the AC actual values from the CCU and also pull error codes?
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Terry Allison
N. Calif. & Boca Chica, Panama
09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)
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