Also make sure the temp indication is accurrate. I spent way too much time going after a low temp problem (don't ask) when all alone it was a bad temp sending unit.

I would push on it a little and the temp would go to normal.

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)