Check your temperature sensor (not the sender). The sensor is the 4 prong unit located back by cylinder #6.

Use an ohmmeter to check both elements, both should read identically. I have posted the resistance/temp charts here previously as well as a how-to.

If your temp sensor goes, your fuel economy drops radically. Ask me how I know.....

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-tp


1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition