Sight Glass
David,
Have you looked behind the driver's side headlight assembly? That's where mine is located. It looks like a round tubular assembly with a small (1/2" dia) glass on top.
BTW, MB specs says you should hold the engine at 2000rpm for that test! Also my engine temp was 85C and I did NOT do it at 2000prm but at idle.
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Regards . . . . JimF
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'94 S500 Cpe
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