I can't seem to access any of the online W123 manuals so I turn to you. Help me locate the aux fan switch. I see two items that look like it could be it. Is it the red arrow or the green arrow?
If I put juice to the fan, it comes on. I get a current through the relay in it's natural "fan off" position, granted, I realize the relay could still be bad. It's got to be the switch, the relay or a bad wire. It's only about $40 to replace the switch and the relay, but I'd prefer to only replace the parts that need it. Can anyone comment on what is most likely the culprit. Is there anyway to test the switch other than heating it to 212 degrees?