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  #1  
Old 05-26-2006, 10:30 AM
blueeagle289's Avatar
Blue Eagle
 
Join Date: Nov 2003
Location: Dallas, TX
Posts: 457
Wink Heat sensing system - 420SEL

I have a minor problem on my 420SEL; need help with ID of the parts/connection involved. There is a small metal stud right above my thermostat area that sticks up and a black plastic fitting with a metal part inside that goes down over the engine stud. There is a wire sticking into the plastic fitting, but I don't know what the actual connection is supposed to be. My engine temp is not registering at the dash and I want to get whatever part(s) required to read and transmit the engine temp correctly .... can someone help me with this?? Thanks, Ben Carter
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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)
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  #2  
Old 05-28-2006, 08:22 AM
blueeagle289's Avatar
Blue Eagle
 
Join Date: Nov 2003
Location: Dallas, TX
Posts: 457
Talking 420SEL Heat Sensor fixed

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)
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