in my 83 sd the rear console vent does cold in the summer and fresh in the winter. the manual says to keep it closed in the winter. it does sound like pod issues. if the sliders under the center vent are working properly then to the mity vac you go.

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77' 300D, "Cartman" SOLD @ 150K (didn't know what I had)
83' 300SD, "The Superdon" 325k+ @ 28mpg
95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg
95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head
99 Suzuki Intruder "Trudy" @ 45 mpg