Join Date: Sep 2014
Vehicle: 2004 SLK 320 Special Edition
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I found this thread after I noticed white residue on the expansion tank for my '04 320 while I was cleaning under the hood and promptly broke whatever fragment of plastic was still holding the barb on.
I reinserted the brass nipple and took it for a test drive. Although it wasn't going to blow out, it was leaking pretty good without the bit of crust it had.
Pelican had an OEM tank for $96 (it's where the washer fluid is warmed smh) so I'm waiting for it to get here. Meanwhile, I thought I'd share a tip:
As a stop gap measure I took about 3/4" of teflon tape, wrapped the brass nipple 3 turns and put it back in the hole. It's doing the job so far. YMMV.
THIS IS NOT INTENDED AS A REPAIR.