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The Radiator Fan in GMC Yukon automobiles is of great importance in controlling the excessive temperature of the engine through circulation of air on the radiator. In particular, this process is essential when the vehicle does not move, or its speed does not exceed several tens of kilometers per hour, and there is no natural convection of air. The GMC Yukon comes with both mechanical and electric Radiators Fans; by far, the current models use electrical powered fans, usually 12 V motor-effected. These electric fans work on coolant temperature and can turn on when the air conditioning has been switched on. Mechanical Radiator Fans that are usually fitted on the water pump shafts are run by the crankshaft and incorporate a thermal clutch that de-couples at higher engine speeds to reduce noise and fuel consumption. To the contrary, Fan assemblies are installed on the electric fans since it fit into a shroud assembly to allow free air flow across the radiators. The main distinction between these types lies in their operation: mechanical fans work under control of the engine while electric fans work on the basis of the temperature and A/C needs result the better performance of the GMC Yukon cooling.