Fitment: 2003-2004 Lexus GX470 2003-2004 Toyota 4Runner 2001-2004 Toyota Sequoia 2003-2004 Toyota Tundra Features: 1.Prevents Overheating: Automatically adjusts fan speed based on engine temperature. 2.Saves Fuel: Reduces energy waste, cutting fuel use. 3.Extend component life: Stabilize the pressure of the cooling system, protect the water tank, cylinder gasket, and electronic components, and avoid explosion or failure caused by overheating. How to Detect a Faulty Fan Clutch? 1.Fan spins excessively when engine is stopped. 2.Poor A/C performance at idle or low vehicle speeds. 3.Fan speed does not increase when engine is hot. .