Freightliner M2 Business Class Coolant Reservoirs - Essential Components for Proper Cooling System Performance. This product lineup includes a variety of replacement coolant reservoirs designed to fit Freightliner M2 trucks. These coolant reservoirs play a crucial role in maintaining the optimal operating temperature of the engine, helping to prevent overheating and ensuring reliable performance. With features like low coolant level sensors and durable plastic construction, these reservoirs provide a reliable solution for Freightliner M2 owners seeking to replace worn or damaged components. Whether you need a direct replacement or an upgraded reservoir, this selection offers the high-quality parts necessary to keep your Freightliner M2 running at its best.