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Old 06-28-2002, 12:38 AM
mikemover's Avatar
All-seeing, all-knowing.
Join Date: Aug 2001
Location: Atlanta, GA
Posts: 5,514
Jumpy temperature guage

Hi fellas,

The temp. guage on my SD is erratic sometimes. It will jump around while I'm driving, or sometimes at idle as well. Usually jumps up and down from around the 100 degrees F mark to 180 or so, quite spastically and for no apparent reason, and then levels out to the correct reading. It seems completely unpredictable...I cannot find any particular combination of circumstances that causes it.

Any ideas?...Bab sensor, bad guage, shorted wire?

1979 300 SD
350,000 miles
1982 300D-gone---sold to a buddy
1985 300TD
270,000 miles
1994 E320
not my favorite, but the wife wanted it
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Old 06-28-2002, 02:25 AM
Registered User
Join Date: Mar 2002
Location: S.F. Bay Area
Posts: 502
Flicking gage


We're going to have to stop meeting like this! My son had a problem just like yours on his Turbo 300D. One of two things fixed it. He replaced the temp sensor and then found a hairline crack around the neck on the surge tank. Obviously the surge tank was leaking pressure and substantailly lowering the boliing point, probably causing the gage to jump around. Anyway, check around the neck of the tank. Hope that helps.

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Old 06-28-2002, 06:52 AM
engatwork's Avatar
Join Date: May 2000
Location: Soperton, Ga. USA
Posts: 11,232
Mike - pull the temp sensor and see if you can "wiggle" the terminal against the nut that is used to screw it into place. I have seen the "loosen" and cause the exact problem you are describing.
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