103 question
 

forum i have about gone blind looking for this answere.
i have a 1991 300e 3liter, there are 3 temp sensors on the head, one closest to firewall has 4 post and is b2,next toward the front is a single post sensor, it controls the temp gauge on the instrument panel, next toward front is a blue 2 post sensor,i cannot locate it on any manuals i have and have serched the forum for its job, can anyone help?
thanks larry perkins lou ky

I'm pretty sure it's the 105/115 switch for the aux fan.
Jump it Key on to start the fan.

i think just un pluging it should start the fan if all is working correctly

click the link below...then scroll down almost to the bottom.

You will see a large color photograph depicting what I think is the item that you are referring to.

If that is not it, then please post a pic.

Good luck.

JimF's Cool Harness

So... whats wrong with my 86' 300E M103?

It turns on upon a bridge if the sensor connector wires.


Or maybe they switched from on=on to off=on at some point.

Read up on the link that I provided you 9above).

It may contain the answer to your question.