i think only Gen2's have the Klima relay, their auto climate systems is a little different than the Gen1's. there's a temp control relay near the blower housing if that's what you're looking for

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1983 300SD (daily driver)
1991 420SEL (work in progress)
1979 300SD (future replacement for 83 SD)

RIP:
1983 300SD (totalled)
1986 420SEL