180º Heavy Duty Thermostat - Direct OEM Replacement for Mack Trucks with Corrosion-Resistant Housing

This 21412639 180º engine thermostat is engineered as a direct OEM replacement for Mack heavy-duty trucks, precisely regulating engine operating temperature to maintain optimal cooling system efficiency and prevent overheating or cold start wear. Made with high-quality thermal sensing components, durable sealed housing and corrosion-resistant materials, it delivers sensitive temperature response, long service life and stable performance under extreme road and engine load conditions. It features exact dimensional accuracy for seamless installation and perfect compatibility with matched Mack engine models, an ideal aftermarket replacement for repair, maintenance and fleet servicing.