Water getting in to drivers matsand you can hear water in the drivers sill

Are the drain holes in the bottom of the sills still open after the new sills were installed?

try under the floor mat close to the door sills

it goes from the pull lever under the floor mats close to the door sill

The windshield metal post from the roof to the bottom
of the door sill is called an A -pillar
That is what your door hinges are bolted to

The metal to your right as you enter the vehicle is
called the B-pillar
That is the one with the drivers door catch

The roof down to the door sill on the rear door of a car
or rear window downward is called a C-pillar

You may hear those terms if you watch a NASCAR race

The door sills are the metal sometimes covered with plastic
you swing your feet over to get in at the bottom between A & B
pillar

You may see rubber or some type covering just past the hinges
as you look into the front fenders

Inside next to the driver or passengers feet ,on the inside,
are what is called kick panels,inside sheet metal on A Pillars

Take a look for a corroded splice in teh driver's side door sill. There are 2 places, 1st is up by the A pillar, this is a blue w/ white stripe wire.


The other ( that seems to be on SuperCabs ) is a purple splice by the c pillar


the splice is 2 wires in on one side, and a single wire on the other. The splice is covered is something that resembles hockey tape, and holds water, if it gets in the door sill.

If you pull the driver's side door sill, you should find a splice ( 1 wire to 2 wires ) that is corroded.
Some what common, water gets into the door sill and cannot drain out, and the splices pay the price.
You will need to cut the splice apart, solder in a new piece of wire, and you will want to use marine heat shrink tubing on them.
This is the typical ( not only ) locations
Standard Cab / SuperCab


SuperCrew

You need to check under the car for rust holes in the chassis or up under the door sills or wheel wells. Its that or a chassis seal is gone.

Water could be in the sill sections. There are usually several drains in every door and box section but the sill drains tend to be small and easily blocked by factory applied sealer as much as mud and dirt.
Sometimes a drain has to be "modified" and sometimes a new temporary or permanent drain must be produced.

The water location might be pinpointed by jacking the vehicle in certain ways while stationary.

I have water coming from under the dashboard as well when the A/c is running. My fathernlaw is a mechanic and he thinks the drain for thea/c is plugged underneath. He says you must have the vehicle on the hoist and get it from underneath. I am having other issues with my Dodge caravan, and is been in the shop, so I have not had a chance to get under and look at it and try to fix it

I have a 2006 MX5 sport. The car has experienced water into the boot which was due to a blocked drain that is located just behind the driver bulkhead. When you release and secure the hood back you can see a small grill that the roof drains into on both sides of the roof bay. Firstly you can try to put warm water down, you can then see the water collecting before draining away just below the grill. If this doesn't work (as was my case) I firstly moved the plastic fittings gently apart and vacuumed out the area (ensure it is dry- don't electrocute yourself) then got a garden hose and found the drain hole that is easy to find (you'll need a small torch). Using the hose (without the valve on the end) and crimping it to vary the pressure I flushed out the debris that had collected in the drain pocket (looked like leaves and sludge, similar to the gutters). The drain comes out under the right and left underside of the car. All in all about 1 hrs work most of which was getting the hose and hoover out!

Hope this helps.