The coolant tank contains coolant fluid that is discharged from the cooling system attached to the engine. Pressure builds up and released when the coolant is hot and expanding through the radiator and when the engine cools down, the excess fluid flows back into the radiator from the coolant tank of your vehicle. The radiator coolant overflow expansion tank can easily be located on the engine bay mounted on the engine near and connected to the radiator. If you are experiencing leaks, low level of coolant and overheating engine then you may have a problem with your coolant reservoir tank. Compatible with the Following: 2013-2021 Encore 1.4L 2013-2021 Trax 1.4L 2013-2019 Trax 1.8L Replaces Part Numbers: 95269001, 95201979, 95380033, 13502353, 603-955, 603955 This is a compatible replacement part manufactured by AA Ignition. This coolant reservoir tank is NOT a genuine OEM part. Vehicle makes and their associated vehicle models and part numbers are used in this listing only to identify the vehicles this radiator coolant overflow expansion tank fits.