Coolant reservoirs are an essential part of your heavy duty truck's cooling system. Any problems with this part can quickly lead to issues with the engine — so it’s important to choose a high-quality coolant reservoir.FleetPride understands this concept, which is why we have a large inventory of parts from the most recognized, quality-built brands like Dorman. Choose from a variety of coolant reservoirs for a number of makes and models, including Freightliner coolant reservoirs, and engine coolant caps that are designed to meet your heavy duty needs.