Thanks for the help. I'm going to check the rear window seal. Thanks for advice Rob, and I will check below the battery, but I'm in Texas, my cars have ZERO rust. I realize that the rust you're speaking of is caused by the battery, but I just changed engines and cleaned up everything in the engine compartment including replacing the battery tray, there was no rust anywhere behing or below it.

Thanks again

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Larry Bible
'84 Euro 240D, 516K miles
'88 300E 5 Speed
Over 800,000 miles in
Mercedes automobiles