Description: Coolant Thermostat
Condition: New
Brand: International®  
Part Number: 4417.81D
Type: Thermostat

Functions: 
Temperature control: Maintains optimal engine operating temperature by controlling coolant flow.   
Warming up: When the engine is cold, the thermostat remains closed, directing coolant through a smaller circuit to quickly warm up the engine.   
Cooling down: Once the engine reaches operating temperature, the thermostat opens, allowing coolant to circulate through the radiator for cooling.   

This thermostat is important for maintaining the engine at the optimum operating temperature by regulating the flow of coolant. When the engine is cold, the thermostat is closed, helping it warm up quickly, and once operating temperature is reached, it opens, allowing coolant to circulate through the radiator for cooling. This ensures efficient engine operation and prevents it from overheating.

Navistar® is a proud manufacturer of some of the widely used trucks, yellow school buses, defense vehicles, and engines. It was recognized as the first truck and engine manufacturer to be certified by the EPA for meeting 2007 standards for hydrocarbons and particulate matter. But the company's global portfolio is not limited to its line of vehicles and engines—it also carries high-quality replacement parts and accessories to keep all these working in top condition at all times. From hose fuel, bolts, plugs, rivets, and bearings to flashers, incandescent lamps, camshaft brake, gasket injector, and spring door locks, Navistar has also got you covered.

Warranty
First Truck Parts offers a 365-days warranty for all types of parts and in any condition. The warranty applies only to buyers who have placed an order on our website