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Hello, I am Jose Sebastian. Your mechanic automotive expert, It's a pleasure to me to attend your question. Thank you very much for trust in just answer.
Dear customer, the fan is usually activated for the temperature sensor in the thermostat. and when it is defective cause problem like this, also the actuator can cause this problems.have you checked them?
Dear customer, i will share a video where it is explain how to find the thermostat, i was trying to locate a video or diagram ofyour ducato but i could not find it, so i havee this video where you will watch how to follow the hose to find the thermostat in your van. Please let me know if you find it. Regards, Sebastian.
https://www.youtube.com/watch?v=RIC6Z4D6Q3E
Also, if you want, you can attach a picture to help you locate the thermostat and the sensor in a better way.