a/c duct diagram for 96 Lumina 3.1L

Hi, I was wondering if there is an online a/c duct diagram for a 96 Chev Lumina (3.1L engine)? My switch that routes the different duct paths
(floor, defrost, vent) seems to be broken, or there may be a baffle, etc., closed, as the vents don't blow air.
Thanks, Louis
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