Rear passenger floor wet after rain?

If you are getting water in the back but not the front then the likely cause of this is the door seal or the sunroof. Do you have a sunroof?

If you do then we need to check the drain and make sure you are not getting water in the back from that drain. Just open the sunroof and pour water down the drain and make sure it is not making its way to the back seat. You are going to have a drain that goes to each corner of the vehicle so this could be the issue.

However, how much of the carpet is getting wet? Is it the size of a baseball or basketball, or larger?

When you say it is a puddle, is it standing water on top of the carpet or is the carpet and pad soaked as well?

Basically the best way to find this is to remove the carpet, close the vehicle, and run water on the vehicle until you see water come inside the vehicle. This will allow us to track down where it is coming from.

We just need to double check and make sure there is no water on the front floor as well. That could be a leaking evaporator that is soaking the rear carpet as well.

https://www.youtube.com/watch?v=q9_MZiS2_NE

I suspect this is not the issue but let's just make sure.

Okay. Wow, that is quite a leak then.

Did you drive the vehicle in the rain and notice this water or did you just leave it sit outside?

If you drove it then we need to get under it and look for a rusted hole in the floor board or remove the carpet and inspect for the same. Clearly a 15 year old vehicle should not be this rusted but it is possible with that amount of water.

Let us know if you can get the carpet out and start water testing it or what you find as that is the next step. It will need to be dried out or replaced any way as with that amount of water it will start to grow mold.

Thanks

That is hard for me to answer only because I am not sure of your confidence level. If you are not afraid of breaking some trim when removing it then I would give it a shot. It is going to take patience because it is a little time consuming pulling trim out and carpet but once it is out, finding the leak path should be pretty easy as you will see where it is running in from. At that point you can just dust baby powder all over and that will show the clear path and where it starts.

So if you want to give it a shot, it is not difficult, just gets frustrating. With that info, if you don't want to deal with the frustration then I would recommend finding a shop that specializes with leaks. If they don't then they may not have the patients either and not want to spend the time needed to find it and fix it properly. These are the shops that just fill every cavity they can find with sealant and hope they get it.

Let me know what you decide and we can go from there.

Thanks