I have a interior water leak. I pulled the battery and checked the drain under the battery and found no problem. I vacuum the area. Where else could I get water.

the water may be in the rocker panels of the body ( that area that runs under the doors from mudguard to mudguard on the sides ) there will be drain plugs in the under side that will let the water out. I would be checking the rear window for leaks and the boot lid seal. Check the boot seal for security by placing a layer of Vaseline on the boot lid where the rubber will be touching and close the lid. Open the lid and see where the vaseliene has not been disturbed and that will be the leak area

sounds like your A/C drain is clogged since its in that area...only other drain holes are at the very bottom of the doors which would not cause a build-up of water in the area your talking about...chek A/C drain hose/pipe...if its raining when you find this build-up of water then possibly your windshield needs attention...just squirt a water hose at the windshield in the general area of the leak and have someone look inside for any leaks...Cecil

I had the same water leak issue with my 2005 uplander LT. I seal around the drain tube with RTV and I actually put a flexible plastic tube on the drain at the firewall to make sure water wasn't coming in. Although this is a known common problem. It did not fix my water leak. What I found is the body seam weld at the driver's side kick panel down by the parking brake pedal was leaking. Pull the carpet back and have someone spray the windshield with a water hose and look for leaks in this area. I had to loosen the driver's side fender to pull it away enough so that I could RTV (sealant) all of the seams in that area. I have not had a water problem since.

Could be condensation from the air conditioner. This normally drains out a tube near the glove box, onto the ground. If this drain tube comes off or is clogged, the water will drain into the interior of the car instead.
Could also be a leak around the windshield, door, or sunroof.
When do you notice it most? Warm humid days, or after a rain or car wash?

Two areas to check. The sunroof has several drains that can clog. Open the sunroof and look in the four corners. You will see small holes. Try flushing water down each one with like a cooking baster or spray bottle. If that won't clear a clog use a long wire but with a rounded end. You could cut rubber parts if the end was sharp. The second area is in the door panel area. Each door should have drains in the bottom. If they are clogged it will overflow into the interior. Also if that door has been serviced and the moisture barrier was not reinstalled correctly you will get some water leaking inside.

the condensate drain is plugged, pull the blower motor out and clean the drain, u will find it full of leaves.

My 2001 passat did the same thing. my leak was coming from the door panel. Open your door and use a water hose to simulate rain water running against your window. Water should run into door and drain out of several drain holes at the very bottom of your door. Check for water leaking from the bottom of your plastic door panel. The water runs down into the door and leaks through your inner door panel seal causing water to leak inside from the bottom of your door panel and run into the floorboard instead of draining out the water hole in the bottom of your door.

Rather than pay the dealer $350+ to fix this, I found the "L" shaped drain hose behind and interior to the front passenger tire (I let the car idle with the AC on and waited for a drip. On my back on groud I reached in and found the drain line and it came off i my hand and about 4 oz of water and some decayed matter floowed out. I reaced back in and found the hole to which the L line was attached. It was a rubber fitting on the end of a metal pipe. The fitting came off easily and then about 8 oz of water flowed out (carpet had been soaked for two days). I reattached the L drain line and noticed that inside the fitting was about 1/4 tsp of "mulch" - decayed leaves, pollen, etc. Reattacted the fitting and water now flows freely out the drain. And yes, its a very high humidity area - Houston, TX. And if you live anywhere near here you know about the intense yearly dispersion of Pine tree pollen. I thisnk that accelerates the blockage. Happen about every 2 years. (Third time for me. First two I let the dealer over charge me for this effort. BE SAFE WORKING UNDER YOUR CAR!

Check the vacuum lines, starting at the firewall in front of the passenger side and trace backward.

I have a 2006 Fusion with the same issue and I fixed it for less than $2. There is a drain tube that goes from the passenger floor board out through the firewall to allow water to drain under the vehicle. However, water can travel along the underside and seep back into the vehicle. I went to a hardware store and bought a few inches of 5/8" tubing. I simply slipped this onto the drain and the water now flows down the tube and safely away from the interior of the car. Been dry ever since.