I havent found any signs of leak yet. This just started happening last week. All it does right now is windows fogging and i can smell it when i turn the heater on.Do you just have a pinhole leak causing window fogging or is it actually leaking fluid?
I was about to get my heater core replaced on my Passat last November but then it self sealed. I never acutaully had a liquid leak though just some fogging/film on the windows. I spoke to MrChill about this and he said it fairly common and his Jetta did the same thing.
Mine is bypassed, but it was 40 F here this morning. I am still packing enough pounds to handle south Texas winter. But I do have a new core sitting in the garage.....maybe when I retire or my kids quit bugging me with their problems will I tackle this nasty job.Bypass the heater core. It's still warm out!