The 190e was getting hot and even overheating in traffic with ambient temps around 60 F. The temp gauge would creep from 80 degrees to over 100. The Aux fan even came on. Eventually the car started spewing coolant.

I checked the electro magnetic fan clutch with an external electrical source and it worked . I replaced the thermostat. I double-checked the coolant mix (about 50/50) good to about -5.

I ordered a new sensor (three prong-red) using my chassis number. The new one has the same rating as the old 100/107 C degree.

Problem solved: Engine never gets to 100 C. The electro magnetic fan clutch clicks in and out properly now.

According to a tech friend these sensors just get bad over the years. Too high resistance.

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)