Its wider at the exterior than the interior, more like something ate its way in. It could also have the the 4 inch woodscrew we found going through the false firewall...but I doubt it. It may be that the aluminum eating mites claimed by MBUSA are to blame....I guess If I had known where the hole was I could have put some jb weld on it with a mirror, a flash light, and a plumbing snake. I am on my way up now. I'll have ac before long.

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77' 300D, "Cartman" SOLD @ 150K (didn't know what I had)
83' 300SD, "The Superdon" 325k+ @ 28mpg
95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg
95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head
99 Suzuki Intruder "Trudy" @ 45 mpg