I have had my multijet 8 years now and have never heard the fan. I change the oil every year and always get the oil good and hot, and well mixed before changing it. Every time, I manage to get oil all over my fingers, it is not very hot, nothing like petrol engine oil temperatures. An adjustable blind in front of the rad would be nice. However, I believe that the temperature gauges are controlled to go to normal and stay there unless the engine temp rises above predetermined levels, so as not to worry drivers. Old cars gauges used to go all over the place, I recall.