Steps to replace right hand side door internal window seal

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There may be a torn, missing, or loose door gasket. If you inspect the seal and find torn or missing segments, repair or replace. If the seal is intact, the the most likely cause is a gap in the door seal near the top rear of the door. This happens over time because the door frame can actually get bent slightly outward. It is so little as to not be visible, but you can hear the wind noise. The way to get the noise to stop is to open the door and roll the window all the way down. Then, holding the door firmly, grasp the upper rear corner and pull it inward (toward to the car). A couple of sharp tugs will usually do the trick. I know it sounds silly, but it works. BE SURE TO HAVE THE WINDOW DOWN OR YOU COULD SHATTER THE GLASS!
The door frame is quite thin compared to other car body parts and will bow/bend if you pull on it. Start out carefully and if you don't get the results you want, try again with more force.

doors or windows doors the seals go under trim that must be removed most just snap in place some use screws remove and replace weather strip . door seals they seat around the top in a grove on either side and inserts along the sides and bottom. door window seals out side remove door panel remove mirror pull up remove moulding inside just pull up strip and replace.

I recently purchased a 2008 BT50 dual cab then 2 days later we had 500mm of rain and of course it leaked :( I had about 80mm of water on the drivers side floor and 30mm on the passenger side floor. I stripped the interior out of the car and started hosing the outside and watching where it was coming in. I took all the windscreen surrounds off and the cowl panel off below the screen there was no water coming in from that area. I had taken the gutter seals off but left the door seals on so the water was running down around the outside of the seals (with the door shut) and out at the bottom. From inside near the drivers side kick panel I could see water coming through seams in the metal work and when I took the door seal rubber off the body on the car I could see water was getting in at the top of the door seal rubber going down the front inside edge of the rubber and getting in through the seam where the rubber push's onto the body of the car (first problem). I took all the door seal rubbers off and run a bead of non corrosive silicon inside the cavity and pushed them back on. It seemed to have fixed the problem I dried the carpet and put it back together..Two weeks later we got another 325mm of rain and it leaked again :( not near as bad this time. Looking at the bottom of the door where the door trim meets the door I could see water coming from behind the trim and then into the car. I took the door trims off and could see water gets in when the window is up (all cars do) and is supposed to run out the drain holes in the bottom of the door but the water was dripping and splashing up to the back side of the door trim against the sheet of plastic that is supposed to seal against the door with the black mastic (it doesn't) and running straight into the car. I cut some plastic and siliconed them onto each opening on the inside of the door frame and then put the factory piece of plastic on as well (properley this time) as a backup.
So far so good.

Check the seal around the drivers door. Try to determine the level of saturation as you move your hand from the door to the center console. If it is wetter closer to the door, this would indicate the door seal of the door window seals are damaged and need replacing.

4. possibilities.
1.a grommet on the firewall is missing
2.a grommet under the carpet is missing
3.windscreen been replaced and not fully sealed
4.the diaphram(thin plastic film)behind the door trim is not sealed around the edges.
happy hunting......

blocked drain holes at the bottom of the door
missing plastic membrane that seals off the door openings before the trim is put back on door opening seals broken or not sealing properly

If you remove the door rails at the bottom of the doors you'll be able to lift the carpet and visually look for some small drain plug devices. It sounds like one or more of them is missing or that you have lost a seal in the door or window.

pry it up with a screwdriver and the new one just pushes into place.

If it is not the drainage holes from the sunroof as suggested above, then it is almost certainly the seal at the bottom of the door nearest the wet patch. Remove all plastic interior door trim and you will see a rubber seal running around the lower part of the door which prevents water ingress. With age, the seal leaks and water enters the inside of the vehicle at the bottom of the door. It is easily resealed with a suitable sealant from an autoparts' shop. About one hour's labour. Good luck.