I’ve been dealing with heavy rains in Southern California the past few days.every year I get water on the front floorboard,I’ve drained the tubes from the sunroof front and rear. I also pulled the antenna off and replaced the gasket with new rubber assuming it was getting in through that and going down the A pillar ,I don’t see anything coming from the firewall as well . I’ve noticed a huge puddle collection on the back left passenger side behind the driver seat The other day and did my best to dry it up.i have no idea where it’s coming from, On the passenger side front and back is completely dry I’m noticing water only on the driver side front and back completely soaked about a 1/2 to an inch just chillin back there,I’m assuming it’s coming from underneath the car maybe? I’ve looked up in the headliner and don’t see any water coming from above which leads me to believe it’s coming from below today I was at work and it was parked while it was raining and I get in my car to leave and I noticed the puddle was back so I’m completely lost at this point I’m waiting for spring weather to come so I can completely gut the inside of the car and sit inside with a hose pouring on my car to find it .but if anybody has any Information to share on what could be causing the water on the whole driver side front and back would be nice ,feel free to ask me any questions on what I’ve done to try to track this down thanks

 

Mine leaks on big rains through the fresh air intake underneath the windshield wipers. I just drilled a hole in my rear driver's-side floorboard to let it drain. If you really want to fix the issue you'll have to pull the dash and put new seals on the fresh air intake.

 

**** that’s waaaaaack, 😒 thanks DaX

 

I would double-check the sunroof drains; I blew air through mine and had to clean up the clogged drains a few years back - there was a pond in my car after a heavy rain.

Did you test the drains by running some water in the sunroof tray and making sure it comes out at each corner of the car?