I believe that is the switch for the auxiliary fan. You may be thinking of the oil temp switch on the side of the oil filter housing. You can try disconnecting it and grounding the lead to see if it makes a difference on the start. I doubt that it will help, though.
I can't believe I'm suggesting this, but what about a push button to fire the cold start valve?
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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
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