These are the most common symptoms of a failed fan clutch:
Some fan clutches will show no visible indication of a problem yet may still be faulty. The following may also indicate a faulty fan clutch:
Standard Duty Thermal
Heavy-Duty Thermal
Severe Duty Thermal
Multiple failures of new or rebuilt water pumps on the same vehicle when the failure appears to be bearing or seal related should perform the following:
Closely inspect and replace the fan clutch if visible movement of the shaft in a vertical or horizontal direction is noted when checked by physically applying pressure to the fan blade in a front to back direction with the vehicle turned off and the battery disconnected. When the fan blade freely rotates when physically turned by hand while the vehicle is turned off with the battery disconnected. When the fan clutch shows signs of fluid leakage at the front thermal pin area located in the center front of the fan clutch or at the rear shaft and bearing area.
Multiple failures of new fan clutches on the same vehicle when the failure appears to be bearing, seal or shaft separation related should perform the following: