ok I have a wet passenger side carpet when ever it rains and no its not the AC, I don't have AC right now. it seams to start at the firewall and spread to the back. Has anyone has this and fixed it? There looks to be some drain hole repair near the passenger hood spring and the sun roof seal looks a lil old but these could be red herrings.

86 420 SEL
factory installed heat seeking missiles

I recently fixed this problem on my car.

The rubber sunroof drain hose had perished behind the headliner at the top of the A pillar.
Water was draining over the upper trim panel, down the A pillar trim, and ultimately behind the dash onto the carpet.

There was also some mild corrosion on the drain tube which didnt help things.

Cheers,
Ben.

Inspect the cowl underneath the battery for rust. Also there may be some plastic screening allowing air flow into the cowl but keeping leaves out; be sure the drain for this is not clogged.

I had a similar problem with my 90' 420 SEL turned out to be a loose gromit(sp?) on top of the roof near that seam line. Patched it up and she's dry as a bone.

__________________
"It's normal for these things to empty your wallet and break your heart in the process."
2012 SLK 350
1987 420 SEL

I will look at both as I do know that the battery area is a lil rusty and seal is looking a little old. is the tube rubber?

I will try to induce the problem on a dry day with a water hose