5131. 5132. Front Right Lower. Lower air duct. PartQualifier: w/auto temp cntrl. PartQualifier: w/o auto temp cntrl. Right.CHEVROLET & GMC. Right.SEDAN. w/o auto temp cntrl. A channel that directs fresh Air into the passenger compartment. HVAC Air Distribution Ducts located under the dashboard. Assembly - Floor Outlet. Cabin Intake. Center. Defroster. Distributor. Extension. Housing. Inlet. Instrument Panel. Outer. Side.