Water on carpet

I have an Volvo 2007 VNL 780, The carpet is in getting wet right behind the driver seat, and right where the carpet meets the rubber mat and that metal trim the links the together, right in the middle of the drivers and passenger seats, at first I thought the refrigerator was leaking but doesn't seem to be the problem is turned off. I was just wondering where is the water coming from, I was told it from one of the windows on the drivers side in the upper bunk, dose any one have this problem, #looks like it Happens after a heavy rain but it doesn't show up until two or three days later.

 

It only seems to be in this one area I did check the driver side utility door and removing inside insulation and see if water was coming down inside the frame, the frame was dry and I could not see any leaks coming to that area in question.#

Where do I start to look for the AC condensation line for the back bunk, I'm kind of new to this truck so any help appreciated.

 

Had the truck wash today, the carpet is wet again, Look like the water is coming in from the windows or the upper haft of the seam of the truck, for the life of me can not fine where the water is coming in.

 

Hardlyervr, I thing you are right, I had the APU running for about 2 hours before the guy came and wash the truck.

So how do I get to lines for the condensate unit to see if they are plugged, do I have buy new one's or just blow air through them. Like I said be for am new to the Volvo unit.

I took a look at the base of the condensate unit on the left side bunk, it looks like floor was getting wet. Where do I fine these hoses for the condensate unit.

Any help will be appreciated.

 

I went under the truck and look for condensate return hoses, they look like a duck bill opening. On one side is open, the another is closed, to keep foreign objects out, it also looks like it was not letting the water escape either. The one for the bunk unit, look like it was welded shut ( age ), #I #put a plastic tube inside that rubber duck thing ( both of them ) to just to keep it open to see if the water will drain, #I hope this will fix the problem for the mean time.