First of all, inspect the fan clutch for signs of failure like noise, looseness, or leakage. Perform cold engine checks by inspecting the fan for bearing play, fluid leakage, or a deformed spring. If issues are found, replace the fan clutch. For hot engine checks, the fan should offer resistance when turned by hand after reaching normal temperature. If not, replace the fan clutch. For Durango models, ensure the condenser cooling fan functions with the AC.