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From digest.v7.n1321 Tue Mar 17 09:50:36 1998
From: "VanHouten, John" <>
Date: Mon, 16 Mar 1998 18:00:44 -0500
Subject: RE:E30 Water Leak

I had the same problem and this worked for me (straight from the digest)

John Van Houten

Water on the (usually passenger side) floor in an E30 is often caused by a clogged air plenenum drain hose. There is a large air plenun at the base of the windshield that takes air from the air vents to the heater core in the center. There is a drain on the passenger side that drains water that comes in the vents out into the engine compartement before it can soak in past the gaskets where the heater core punches through the firewall.

The easiest way to find it is from the engine compt. If you have a 325 (6 cyl) follow the plastic "tube" that holds the plug wires back toward the firewall. If it were long enough to touch the firewall, the place it would touch you will see a 3" by 1" by 1/2" rubber hose comming out of the firewall and pointing down. That is the drain that gets clogged. You can usually clean it by squeezing it on the sides, but if it's badly clogged, you can take it off and clean it out. If you have a 318 or M3, find it by looking at the very inside edge of the battery tray on the firewall.

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