I just fixed what I could have sworn was a belt chirp by swapping out a completely drained battery outside in the dark at -4 F on December 30, followed by buying a new alternator on January 2.

Beware, a dying alternator *can* make a very similar sound, and in my case it went away off idle as well....

Just sayin....

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22