My 280E (M110) rarely ran the Aux Fan. After a year at college with my daughter, it returns with the Aux Fan running as soon as the key is turned to the "on" position and doesn't stop. Searches on this Forum show lots of remedies for fans NOT working. I'm the only person who has been under the hood, as far as I know. I did some fuse work for headlights, but nothing more.

Any suggestions for diagnosing the constant "on" problem?

Thanks in advance for direction.

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'78 W123 280E, 58,000 mi!
'97 Mazda Miata
'94 Isuzu Trooper, 4WD
'03 MB C240 4-matic Wgn - Wife's
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