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Fault in the duovalve is generally characterized by warm air from the side vents and cold air from the center vents. Your symptoms seem to point to under charged system.
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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280
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