Boasting Expertise Built In™, the OTR Coolant Reservoir is designed as an overflow system to contain and manage excess coolant produced by engine heat expansion. As the engine temperature decreases, the coolant recedes into the radiator, ensuring optimal performance and longevity. Indicators of other engine issues being seen within the coolant reservoir include an excessively filled reservoir that can lead to system inefficiencies; the emergence of white smoke from the exhaust, suggesting potential engine issues; and the detection of oil within the coolant tank. If your heavy duty truck is showing any of these signs, this heavy duty coolant tank replacement boasts enhanced reliability and performance overtime, withstanding both high temperature heat exposure and vibrations. FleetPride is your First Click in Heavy Duty®.