I know there have been a few posts about this, but I cannot seem to find where the leak is! lol anyways I pulled out my mats today, and i find the passenger side is wet under there. Its dry on all sides including the back wall and under the seat, its wet only literally under the mat! Also nothing was spilled in there so I know that isn't the cause. Tried taking a look into the cowl drain on the driver side and it's clean and clear. Is there anywhere else I should look? AC looks like it drains fine when it is running and
I hadn't noticed it before. I suspect that it is because it rained yesterday...hmm....any ideas where to look? Is there access to the passenger side of the cowl or drains?

 

I know our 3rd brake light tend to leak. It couldn't hurt to throw a little silicone at it. I know you said your back wall wasn't wet but maybe its running down behind the carpet to the passenger side floor?

 

Heater core leak possibly? Does it smell like anti-freeeze?

 

Wirelessly posted

Check the body gromments under the carpet

 

Thats what made mine leak.
Still leaks to this day. I pulled the carpet up and i was like "oh, thats why"
then forgot about it and did something else.