I have to recommend making sure your gauge is reading correctly.

-Verify the engine temperature apart from the gauge-

I did all sorts of cooling sytem work on the 300E to help its not getting warm enough problem.

It turned out it was a bad connection to the temperature sending unit.

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)