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2004 Sierra AC Drip in Cabin

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Have an 04 Sierra 1500 SLT with the infamous ac condensate leak on the passenger side floorboards.  Unfortunately the underhood drain doesn't seem to be the problem as I'm unable to find a clog in the tube, blowing it out and pipe cleaner therapy didn't seem to help much, if at all. 


Anyone have any other solutions for this issue I can check into?  Its definitely not rain or other water, is only happens when the AC is run, significantly worse when its more humid outside.  I do see dripping under the truck when parked after I run it, so I think I've just got two paths for water to get out...is there another common issue besides the drain that causes this?  Truck has the dual zone fully digital CC controls if thats relevant.



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