The McCormick 6677924A1 Thermostat is a genuine OEM replacement part designed to regulate engine coolant temperature in various McCormick agricultural machinery. This essential component ensures optimal engine operating temperature, preventing overheating and maintaining efficiency. With an 83°C opening temperature, it provides precise thermal control for compatible McCormick X10, X20, X30, X40, X50, X60, C, and CX series tractors. Replaces part numbers 3638069M1, 3638069M2, and 3638069M3.