In addition to the clutch bearings, there are two other critical parts of the fan system: the thermostatic spring and the fan clutch. Without these parts, your truck will overheat and become unusable. Likewise, overheating can destroy other engine parts, including the lubricating oil. If your truck’s fan clutch fails, the entire cooling system will suffer. If you replace the fan clutch, you can be rest assured that the rest of your truck engine parts are intact.