93 300E 3.2 Aux fan on High all the time
 

As of Monday the aux cooling fan has been on HIGH 90% of the time. Granted its been 98+ all week but when I checked the senders and connections I found atop the thermostat housing that the rear Blue sender (2 wires) had no insulation on either wire and most likely the conducters are in contact-a very recent condition,as I do not recall it when I did oil change last Wed eve.

I will strio back the sheath and rewrap them until I get a Saturday free and then I can spend the day installing the new engine harness that I picked up figuring this was gonna happen after 162K and a hot engine bay.

Does the MB replacement engine harness contain the Temp Sender portion or not? If not I assume it can be redone with Shrink Tubing after opening the connector and removing the conductors to install the strink tubing...or is the "liquid insulation/tool dip" the way to go?

Have I fried the AC Relay (KLIMA?) in the process and do I need a new sender?

Sorry for all the Q's at once.

The engine harness does have the wiring to that sensor.
That sensor has nothing to do with the Klima relay, reports directly to the a/c pushbutton controller.

You would need to check the resistance of the sensor with an OHM meter.