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Has anyone had issues with water leaking inside to the passenger side floor? I have a 2012 Volt and I first noticed this issue after a hand wash. The dealership supposedly fixed a clog (something near the firewall I think, I don't have access to the paperwork right now). About a month later I had the same issue after another hand wash. I took it back in and they couldn't find any leaks with their water test. Now, about 5 months later, same thing after some heavy rain, passenger floor was very wet. Car is back at the dealership and they still can't reproduce the problem! Has anyone experienced something similar or have any suggestions? It's incredibly frustrating that I paid for this to be fixed and I'm still having the same problem.
 

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https://gm.oemdtc.com/2476/water-present-on-front-passenger-floor-2014-2016-cadillac-elr-2011-2015-chevrolet-volt

Or...

After checking to make sure the drain from the evap box was secure and clear I proceeded to gain access to the cowl area below the windshield. Remove pop up fasteners, remove windshield wipers, remove plastic cowl cover.
Sure enough the bottom of that cavity had an inch of water. Siphoned out the water, Put a piece of plastic tubing and blasted the rubber drain with about 80 psi, Checked by pouring water in there and was it pour out from underneth the car.
So, i removed the passenger side wiper arm, took out all of the plastic fasteners, lifted it up and looked in from the passenger side. You'll see a large air intake in what is essentially a tub (great for holding water evidently), and a rubber drain hose at the bottom. My hose was stopped up (tested by pouring in water), and the blockage was near the bottom. I guess the PO parked under a tree with small leaves or the like for a couple of years.
Hope that helps.
 

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Sounds more like the A/C drain pan. My wife's Scion had the same problem. The drain hose get's clogged, and the pan overflows.
I've never looked for the drain on my Volt, as I've never had a problem.
 
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