Wet passenger side carpet, 2003 XC 70. Any ideas?

[Blacklab467]

I pulled the seats out of my car so I could remove the carpet to do a thorough shampooing yesterday and found that the passenger side foam under the carpet was wet. Not real wet, maybe a cup or two's worth of water had saturated the foam and had migrated to the rear passenger side also.
I'd been meaning to check the sunroof drains for some time so I figured that this was likely the cause. I checked both front drains and found no issues, dumped about a cup of water in each side and it came out the proper vent on the bottom floor.
I also checked the cowl drain and it is working fine as well. I then checked the bare floor on the passenger side and it was perfectly dry, as was the drain that comes off the fan area.
I'm at a loss for where the water may have come from now and don't want to put the clean, dry carpet back in without finding the problem. I'm wondering if it may be caused by a poorly installed windshield? I can't think of what else to check!
Thanks in advance for any constructive ideas.

[MoVolvos]

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Check your back seat floor board. On our 09 S60 AWD it was the rear drain that was clogged and migrating through the C-Pillar to the back floor board then into the front seat area. When it rain heavily the water will come out the side of the headliner .
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[MoVolvos]

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It was the blue passenger side back sun roof drain that was clogged. Some compress air or curtain wire pushed in from the bottom should clear it. Careful not to push too hard so it doesn't detach the tube at the top or else the headliner has to come out.

White Curtain Wire Hanging Cord
https://www.amazon.com/cyclamen9-White- ... r=8-3&th=1

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Passenger side.
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Driver's side.
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[cn90]

Is it water or coolant?

[scot850]

Passenger side. Blacklab247 said to me it was not coolant (thankfully!!).

Neil.