Nissan 21412-1AV0A Tank-Radiator,Upper

To remove the coolant reservoir, start by disconnecting the overflow hose from the fitting by the radiator cap. Then, unbolt the coolant reservoir and remove it from the vehicle. Pour the coolant into a container and wash out the reservoir using soapy water and a long brush to make the coolant level easier to read. Inspect the reservoir for cracks and chafing, and replace it if any damage is found.