Amazingly, the heat sensor works by just being inserted into the black plastic cap over the engine stud. The wire has an unusual green covering which I guess somehow reacts to the temp at the stud point and transmits it to the dash gauge! I pulled out the wire, bent it double and just put it back in the hole in the plastic cap on the engine. The dash gauge then reported the temp at normal levels, which I feel is correct based on engine performance, etc etc. The easiest fix I ever made, especially without understanding exactly how the dang thing actually works!!

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Ben Harrison Carter
1999 Mercedes ML320 87K
1992 Mercedes 300CE 89K
1995 Corvette 29K -- Sold Dec 09
1989 Mercedes 420SEL 99K -- (Sold 4/08)
1968 Mercedes 230S (106K) (Sold 9/06))
1976 Mercedes 450SEL 130K (Just sold - 06)
1961 Mercedes 220Sb (sold years ago)