Are you looking for the Thermo Time Switch? It's under the Fuel Injection section. It drops the idle down when the temp hits 42.

The 17 deg oil switch is (of course) way down on the right front of the block by the air hoses. Really a pain to find.

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe