I suspect my 240D has a small heater core leak as well. From what I've read it looks like a nasty job. Let us know if Barr's or any other product works. I may have to try one.

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL