Mine is doing the same thing. Exactly. My tentative theory is that somehow it's temperature related, because this only happens to me on hot days after hot drives on hot roads. 90 degrees plus, generally. Are yours similar conditions when they fail in this way?

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~Michael S.~
Past cars:

1986 300SDL
1987 300SDL
1982 240D
1982 300SD


Current:

1987 300SDL