The Engine Coolant Thermostat ACDelco 131-156 is a high-quality car part designed for controlling the temperature of the engine coolant. Manufactured by ACDelco, a trusted brand in automotive parts, this thermostat is specifically designed to fit and function effectively in various car and truck models. With its manufacturer part number 131-156, this thermostat ensures precise engineering and reliable performance, making it an essential component for maintaining the optimal temperature and efficiency of your vehicle's engine.