Temp sensors
 

hi all
I have a 93, 190E.
I have a question about the blue sensor please, when connected the aux. fan will start and stays running as long as the engine is running. I have removed the plug of the blue sensor just to get the aux.fan to stop and I didnt think I will ever need that fan anyway. Any ideas on what might be the problem here and if its OK to leave the sensor diconnected?
The location of the sensor I am referring to is described below:

If we start from the firewall to the front of the car:

4 pin sensor = Igniton and injection sensor
2 pin sensor(blue)= aux. fan/ac
3 pin sensor=motor temp gauge and radiator fan

thanks

Question?
 

190E 2.3
or
190E 2.6

Yes
 

Thank you
Arthur Dalton :D

thank you all for taking the time. The car is a 2.3 , 8v. The sensor I am talking about is blue, not green or black as shown in the parts link above, and the sensor also seem to work fine. I am not familiar with the circuitry of the Aux.fan so I suspecting a sensor somewhere else or a relay to be the culprit. Any thing I could check to isolate the problem? Thanks

The sensor for aux fan is blue and the link I posted is the aux fan sensor for your chassis. and umh, and it is BLUE..

Did it just start happening?
 

Has it gotten wet recently?

yes, I washed the engine compartment, the fan wouldn't stop since. you are onto something!

you are also the only one so far not pushing to sell the sensor which I dont need.

I don't see anyone PUSHING you to buy a sensor. I only see people answering your question as to what the blue sensor is and does .
But you somenow know the sensors is OK .. Well , I guess you did an OHMS/TEMP comparison reading with your Ohm Meter and have verified the sensor to be in Spec.
You posted that you are not familiar with the Fan circuitry, but when people who are familiar and do come to answer your posting, you accuse them of pushing to sell you a part???

We are here to aid you in a diagnosis and are pushing nothing more than fellow good will and knowledge.

Hmmm
 

If you did not use detailing fluid:
* Use compressed air to blow dry all related wires, connectors and junctions.

This should fix your issue, unless the sensor failed or detail fluid was used.

If you used detailing fluid, it may have penetrated a marginal (cracked) harness, shorting it = replace the harness.

Leave it unplugged for a few days and it will dry out.
 

Next time you clean it, cover that up with plastic.

Chris

Glad that it's ok,
 

but just because your fan came on doesn't mean the sensor is good. Mine was bad in my car. The reason it ran when you got it was you created a ground. You can bypass the sensor by plugging both ends of the same wire into the plug. It's an easy way to test your electric fan. Then again if you car never reaches the switch temperature, the fan won't come on anyways. I doubt you need a new wiring harness.

Chris