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The R107 used the early 80s ACC system through the end of production. The silver temperature regulator box behind the glovebox is your most likely issue. Capacitors puke their electrolyte on the card and eat traces, the result is erratic operation or no operation. Fan doesn't run, functions don't work like they're supposed to, temp regulation is hot or cold, not much in between. Buy a rebuilt box, or pay someone to rebuild it for you, a junkyard or used box will be just as bad as the one you have.
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Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)
Black Sheep:
1985 524TD 167K (TotalDumpster™)
Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)
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