Hello short and flush. I need your help. Engine is running. Temperature is rising. Fan is not running. When I briefly lock the fan it is running. Temperature is sinking. Everything Ok. Heating works perfectly. Thermostat is working. Themperature sensor at the thermostat works perfectly. I tested it. Backup Ok. Fan Relays replaced. Fan is still not working. There is no current. I measured. I did not find another thermoswitch. On the cooler is no. Only on the thermostat housing. It is a 850 Sweden bomber running with petrol and LPG 5 cylinders. Eventl. ECU??? Thank you in advance. PS: Head seal is all to info.