Fan clutches reduce the drain of engine power and improve the efficiency of a vehicle's cooling system. Fan clutches are fluid coupling devices which provide air flow through the radiator by using the water pump shaft to power a fan blade.

Fan clutch replacement may be required when any of the following problems exist:

• Engine Overheating
• Silicon leaking from fan clutch unit
• Fan spins with little or no resistance (free wheels)
• Greasy build up at thermal spring or where shaft exits rear housing
• Fan clutch vibrates on shaft or will not turn
• Squealing noises from bearing