I have water on the passenger floor and I suspected the clips, see this thread https://blazerforum.com/forum/2nd-ge...-clips-103515/

I have now found out that most of the water comes from the firewall when it's raining.

I guess this hole is for the antenna cable it has its grommet but that has been removed to give room for the power cable to a wall socket. You can see the grommet and antenna cable to the left in the picture. Since this is a car in Sweden almost all cars has a power socket that you hook up to your house power and it will heat the engine and to the power socket in the inside you can hook up a heater so it is warm when you go to work in the winter.
This is usually done by the dealer and some does it properly and some does it poorly like in this case. They had used some rubber sealer to form a filler but it had fallen out of the hole and when it rains it pours in some and end up on the floor under the mat. It's kind of easy to fix, I just have to reapply some new and better sealing compound there and make sure that it is properly sealing.


But I also found another leak. It is up in the right corner inside of the passenger kick panel.
It is pouring in there too but not so much. You can see that it is a bit wet and moisture is there. Do I have to remover the right fender to access this leak or will it be enough to try to seal it from the inside. I know that it will not be good in the long run.

 

I had a similar problem with mine. I lathered the grommet and hole with clear silicone from the inside, smooshing some into and through the hole. Has been leak free there for several years now