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Toyota Tundra Radiator Fan Relay is in the very center of the truck that makes people admire its power and reliability. Toyota Tundra features a powerful 5.7 liter V8 with VVT-i that combines good towing with good fuel economy, a smooth six speed automatic that makes it quicker, and a variety of cab and payload options which allow drivers to match work needs or weekend adventure. Prudent suspension tuning during later years provides a sure grip at the wheel as the heavy duty radiator and transmission cooler in the towing package keep the temperatures in check on steep climbs and the Tundra proves to be an employee that enjoys strenuous work and long workdays. Under this cooling procedure, the Radiator Fan Relay serves as an electric gatekeeper. When the engine or air conditioning system requires additional airflow, the Toyota Tundra powertrain module energizes the Radiator Fan Relay, closing the contacts and sending full battery voltage to the fan. When the coolant falls below target the relay will close and eliminate noise and save energy. The Radiator Fan Relay is sealed against heat, moisture and vibration and carries high current that the stock fan requires and also allows low current signals to control it, which makes it an important small Toyota part. To install, disconnect the battery, change relay, reconnect, check.