Water in the area under the battery

[NM1]

Hi, My Audi A4 Avant (2006, 2.0 TDi) has stood for 5 months outside. (I was locked down abroad and only just got home) I came to start it and of course the battery was flat. Went to charge the battery and the area under the battery has several inches of water in there. I have removed the battery looking for a blocked drain hole, but I cannot find anything. Can anyone tell me where the drain hole is? (Fortunately all the seals for the pipes are working so no leaks into the cabin. Good old Audi engineering.)  Any advice would be much appreciated. I plan to syphon the water out for now, but don't want it to fill up again.

Many thanks,

Nigel

[audia4b5kev]

there is defo drain plug there bud bit hard to see but defo has one  kev

[s k smith]

Under the battery there is a sort of cover over the drain hole.A peice of welding rod or stiff wire will access it.I had many problems from this.

[B7quattroGuy]

There are at least 3.  There is one under the brake booster.  Take the battery out and poke around with your finger,  the hole will be completely gunked up.  Once you've found it,  just clean it out the best you can.   There is also a fairly big rubber grommet you can just remove (Rounded oblong shape). Pretty much straight under the battery.  There is also another hole on the opposite side to the brake booster.  

 

Id love to know if you have spongy brakes after all this water sitting in there.  I had the same,  and wanted to replace the brake booster as sometimes my pedal feels to soft on the first press.  I have to lift off and immediately press the brakes again and I get a solid pedal.  Garage told me those things dont break.  But maybe water go into mine, as its not meant to be submerged in water. 

Edited February 27, 2021 by B7quattroGuy
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