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1983 300 SD, 1991 420 SEL, 1979 300SD
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Discussion Starter #1
hi all,

wondering what the 3 pin coolant sensor does that's near the 1 pin coolant senosor for the dash on a 86 420 sel...i've looked in the CIS section and cooling section of my manual but it doesn't mention it anywhere ...the part # is 0065454524

thanks
 
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