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Old 07-20-2016, 02:00 PM   #12
mhs4771
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Join Date: Dec 2009
Location: Sebring
Posts: 2,294
M.O.C. #9969
Here's something to try, remove the filter (if there's one) on the return vents, stick your cell phone up there and see if you can get a picture of the inside of the return vent. On our SOB Forum with the same type of system there has been a problem of the vent material not staying up and wires running thru the vent, thus restricting the return air flow.
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2018 Chevy 3500HD High Country DRW 4X4 Crew Cab w/Duramax/Allison, Formally 2010 Montana 2955RL, Now Loaded 2016 SOB, Mor/ryde IS, Disc Brakes & Pin Box, Comfort Ride Hitch, GY G114 17.5 Tires.
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