Water in the back passenger seat in a 2003 lincoln town car?

Q: I got a 2003 lincoln town car and when it rains there is a huge wet spot that forms in the backseat carpet on the passenger side. It was like that couple weeks ago and it rained during that time too. Its not a little leak either it is soaking in that area. I was wondering were the leak would have come from. Thanks Yes it does have a sunroof

A: Good guesses, but it's not the sunroof, nor any of the previous answers. The leak is coming from the front, and the first place people usually see it is in the right rear floor board. If you pull the carpet back in the right front, you'll find that it's wet under there, too. Leak is from the cowl. Take the passenger cowl panel (black plastic piece at the bottom of the windshield) off. Under it, you'll see a sort of oval-shaped plastic piece, with a screen on top of it. That is the fresh air inlet for the Heater and A/C. The gasket that seals it to the firewall has failed. Remove it...it's two nuts. 11mm, if memory serves. Clean off the old gasket and reseal it. You can get some thick gasket material at Lowes or Home Depot that'll do the job, or you could even use a thick bead of silicone. Be sure to clean the surface it mounts to, also. (I actually use 3/8" 3M Ribbon Seal, which is butyl rubber for installing windows, but works great for this..you can get it at serious auto parts store, but not places like Autozone or Pep Boys) Also, clean all the excess leaves and tree debris from around the housing. That'll fix it. I've probably fixed over a hundred of these with the exact same problem, and maybe one of them wasn't caused by this.

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