IN THE BAY Why cooling system management is more important than ever Coolant contamination and general inattentiveness can result in damage to not only the engine, but also a diesel truck's aftertreatment system. By Gregg Wartgow [ POWERTRAIN ] A 16 Fleet Maintenance | February 2021 heavy duty truck's cooling system is primarily designed to prevent the engine from overheating. Secondary tasks are to provide heat to the cab and, in some cases, the trailer. Today, cooling systems also integrate with various elements of a diesel truck's aftertreatment emissions system. That is a lot of responsibility, which is why fleets should take responsibility for emphasizing cooling system management in the shop. Inattentiveness by technicians and drivers could open the door to things »A well kept cooling system bodes well for not only the engine, but also the aftertreatment system. hadynyah | 172771723 | Getty Images