Possible Leak Issue on Older W126

[raymr]

My car started running low on washer fluid all the time. I did a closer inspection and found a rubber plug that was partially disintegrated and leaking. It's at the bottom of an indentation of the plastic tank where another pump motor might go. It's easy enough to see by shining a light down the back of the tank. I replaced mine with a screw and washer.

A slow leak like that can further aggravate the rust problem in that area.