How can you tell if your viscous fan is dead. I'm wondering if mine is either on it's last legs or dieing fast. When you spin the fan when the engine is cold it spins easily & must do 1-2 full turns, when the engine is up to running temp it's a little stiffer but again I think it spins a full turn. My old jap motor's V/C used to roar on start up & when it was working but i've never heard this with the Disco if they do :roll:Oh it's a D2 V8 2000 model