My 08 CF32BL does something similar - some vents have flow, some don't have much. Strange thing is you'd think it's related to proximity to furnace, but it's not. More random than anything. Ductwork in the basement doesn't seem to be leaking, I guess I'd have to drop the underbelly to check the rest under the main floor? Good tip on checking the furnace blanks, I'll have to do that.
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2000 F250 7.3TD Lariat
2008 Crossroads Cruiser CF32BL
2006 Subaru Outback 2.5XT Limited
2000 Audi A4 1.8T
All turbos!
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