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Old 05-17-2018, 08:50 PM
Join Date: Mar 2018
Location: New Smyrna Beach, FL
Posts: 2
Busrider is on a distinguished road
E70 Clogged Firewall Rain Water Drains

My 2012 X5 3.5d has two rain water drains just ahead of the firewall.
How do you access the passenger side drain which is underneath the E-Box and Cabin Air Filter?

I've seen numerous Google discussions about the driver footwell area accumulating water and, to a lesser degree, the passenger side footwell doing the same. Frequently fingers get pointed incorrectly at the sunroof drains for this problem. While those drains can/do get clogged, if you own an E70 then you owe it to yourself to check, clean and maintain these firewall drains. Chances are high that your wet carpet is the result of one of these two drains not doing their job. My E70/X5 is garage kept and I still have clogged drains.

In LHD variants, the driver side drain is easily accessed under the Vacum Brake Booster. Unfortunately, it's evil twin on the passenger side seems virtually inaccessible and in my situation, clogged.

Attempting to dislodge the Electronics box that is blocking my access to this clogged drain, does not appeal or look like the best approach. Would fender and liner removal be the better course of action? ... or is there access from below via removal of the belly pans, etc. ?

Thank you to everybody who takes time to read this post.

Last edited by Busrider; 05-18-2018 at 12:47 PM.
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Old 05-18-2018, 01:02 PM
seattle's Avatar
Join Date: Oct 2011
Location: Seattle
Posts: 491
seattle is on a distinguished road
Recently was doing work in that area. I had to remove both the fender liner and the DDE/ECU for unrelated work, so decided to clean that drain (it was indeed clogged, mostly with dirt.
I found removing of fender liner was pretty tough, but it will still be better option for you, to avoid removing DDE and its housing, cabin filters and their housing, etc.
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Old 05-19-2018, 10:55 AM
Join Date: Mar 2018
Location: New Smyrna Beach, FL
Posts: 2
Busrider is on a distinguished road
Seattle - Thanks for your insight and suggestion. Fender & Liner removal appears to be the route I'm taking this weekend.
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Old 05-28-2018, 10:54 PM
arb arb is offline
Join Date: Jan 2009
Location: San Francisco
Posts: 12
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Busrider, about a year ago my Alarm was sounding faint. After some debug, i found the water on the drivers side was up so high it was deadening the alarm (shocked it was still working as the horn was in the water). I cleaned the drain like you mentioned and checked the other side for good measure and sure enough it was clogged but with way less water. I had to pull up the box and practically disassembly it to get in there and clean the drains. I couldn't come up with a good way to get in there otherwise. I did speculate you may be able to get at it from the bottom side if you find the right trim under there to remove, but not sure...
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