ELECTROVENTILADOR DIESEL 1.9 Model 2009

Hello!!!
I have a problem with my truck, the electrventilator never turns on. The only way to turn on is on the air conditioning. I have changed the thermostat but it remains the same. In the box where the thermostat goes there are 2 sensors: a green of 2 contacts and a blue 4 contacts. If I disconnect the blue sensor with the engine running, turn on the 2 electro -ventilators at maximum speed. As additional data I tell you that there is oil in the coolant. Does anyone know how to solve first, the theme of the enected of the electro -ventilator?
Thank you so much.

I first check the oil problem in the refrigerant.
It may be due to packaging problems.
And if I am not mistaken, the electrventillator is activated by a temperature vulvo that is in the radiator.
Maybe the vulvo is touched with oil and that's why it doesn't work for you.
Greetings and check the oil problem.

Thanks for your answer Guillermo.
From what I saw and I could find out the radiator has no bulb. In the water box where the thermostat goes it has 2 sensors, one of the temperature of the refrigerant or green color and another of blue that controls the 2 electro -seasons and the temperature indicator of the board. In the middle of the 2 electro -seasons, above, there is a box with 3 relays which test and work OK. So far I did not find the cause of the problem.

But did you check the one that acts the electros?
Is it a sensor or is it a thermoswitch?

The last case that had this type was the installation that failed. A clema in poor condition. I hope it helps you.