Greetings All! This is a first-time post, so please be gentle. I am also a novice when it comes to working on cars.
I have a 2014 Altima SV, 2.5, 4D, about 120k miles, and I just discovered a water problem. The first time (about 1 week ago) I found a large amount of water in the right rear floorboard, a small amount in the left rear passenger floorboard, a small amount under the front passenger seat, and a small amount in the front passenger floorboard. I thought one of my grandkids had left a window open and it rained inside, but I wasn't certain because I automatically rolled the windows down when I saw the water, without checking to see if it had been open. I used a 16 gallon shop vac and got about 4" of water out of the floorboard.
After I thought about not noticing if the window had been left open, I began to question the rain idea, had my wife get inside the car and I used a hose to run water all over the car. A poor substitute for heavy rain, I'm sure. She did not see any leaks. So I thought I was good.
It rained pretty heavy a few days later and I sat inside the car to look for leaks. There weren't any. Still thought I was good.
I work from home so I drove the car very little after the above mentioned actions.
This past Monday we had some heavy snowfall (for North Alabama-Huntsville), about 6". The car sits outside and before I drove on Tuesday, the day after the snowfall, I brushed most of the snow off the car, but had to run the defroster for about 20-30 minutes to get all the ice melted. I then drove the car about 20 minutes to a doctor appt, parked it for about 30 minutes, then back home for another 20 minutes. I did notice a large amount of condensation on the inside of the front windshield when I first got in the car after starting it and turning on the defroster. Even after 40-50 minutes, the defroster didn't remove all of it. I had previously noted this issue, and had to run the defroster longer than I thought I should have to, but chalked it up to the cold, moist temps we'd been having.
The next day (yesterday) I went to my car and looked in the back right floorboard, and it was full of water, again. Water was also under the front passenger seat (about the same as the first time) and in the front floorboard (more than last time). The left rear floorboard had a very small amount pooled in a low area. I got about 2" of water in my shop vac.
I checked the sunroof drains and they are clear. I haven't pulled the back seats to see if there is water there, that's my next stop. I did take off the front passenger kick panel on the left, under the glove compartment, to check that drain hose, but I'm not really sure what I'm doing there.
It seems to me like it has to be a drain of some type, since I didn't find water after I had removed the water the first time, even after the heavy rainfall. I'm just not sure which drain to check. Or some hole in the chassis (I think I read that somewhere). Can a defroster that's backed up cause that much water?
Thx for your patience in reading this. Now, any specific suggestions of things for me to try and how to try them?