190e location of sensor for electromagnetic fan
 

I'm perplexed I've lost the use of both my electric fan and the electromagnetic clutch fan on the motor of my 1986 190e 2.3 8v. Neither comes on when they should at the proper temp.
Does anyone know exactly where the sensor that turns on the electromagnetic clutch fan on the engine is located ?
I have located the sensor for the electric fan up by the thermostat and tested it. But I can't for the life of me locate which sensor turns on the electromagnetic engine clutch fan. A good description or photo would be great.
Any help would be appreciated.
John :confused:

in the coolant manifold at the front of the engine.

The 3 pin red or green sensor.

Thanks MB Doc for the quick response. So if I short the power connections coming into the sensor with the engine on the clutch on the electromagnetic clutch should engage if its ok otherwise its dead ?
So far I've tested that theory and the clutvh did not engage just the high speed electric fans. I just want to figure out if I need to replace the red sensor or if the electro clutch is also bad. How can I test this out before just replacing everything ?

When my electromagnetic clutch was not working, it was the sensor. I shorted out the connector with the ignition on, and I could hear it engage. With the engine running I shorted it again and the clutch operated and the fan turned. I replaced the sensor and all is well.