My 1991 350SD has water puddling in the rear passenger side floor area at the depressions where the front seat is bolted. I've done all the water leak searchs and did most of the things recomended: Sunroof front drains are clear (not sure if there are rear drains), took out battery and found nothing, took off covering around wippers to get access to front drains - found rusted hole about an inch up from drain hole, repaired with pour-15 one coat followed by fiber glass matt than followed with three more coats of pou-15. Made sure drain holes were clear. Seals around front and rear windows appear good. Wife had car out for the first time in the rain since repair and the water puddling is back. Hours after it stopped raining water was still sipping in. I would cleaning it up and after a while water is back again. What a frustration. Any suggestions????

SOOOO many places for the water to originate. there are rear drains. if you found rust up front, you can bet it's in the rear as well. pull the kick panels under your dash, and see if you can find any water trails. front windshield is the most common source. the problem is, if it's from the windshield, the water will be running under the soundproofing. so you'll have a hard time locating it.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

My car had a water leak below the windshield in the cowling that caused water to pool there.

-J

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.

So you've got water pooling around the B pillar area? I would suspect you've got a bad window seal on your front window. Remove the A pillar trim, and have a partner hose down the windshield. Remove the passenger side carpeting and observe.

My friends parts 560SEL had water pooling in that same area on the driver's side. His front windshield seal leaks

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82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k

Thanks for all the replies. Guess I need to investigate the front windshield seal. How do I remove the A pillar trim?
Also how do I locate the sunroof rear drains?
Thanks