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Old 11-01-2002, 12:00 AM
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haasman haasman is offline
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Join Date: Jun 2001
Location: San Francisco, CA
Posts: 3,096

I had a similiar problem with our '91 300E. Was running too cool. I was afraid of using up the engine. Eventually it would get above 80 degrees, but even on a warm day it took a loooooong time.

I replace the T-stat and it seemed better, but now with the cooler weather I was getting 80 or less even after hard driving.

From another post it hit me: May the sending unit and/or the conection has a problem. I took the wire off the Temp sending unit and grounded it. Tested fine. I then cleaned the inside of the connector and the post on the sending unit. I gave 'em both a quick shot of WD40 (allows conductance) and guess what!

Normal operating temps.

My 2 cents
'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)
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