To ensure your Citroën Xantia's hydraulic system functions properly, start by checking the hydraulic fluid level and topping it up with the correct fluid if necessary. Inspect for leaks in the hydraulic lines, connections, and the accumulator, as leaks can lead to pressure loss. Regularly clean or replace the hydraulic filter, and consider flushing the system if you notice any performance issues. Lastly, ensure the hydraulic pump is functioning correctly, as a failing pump can significantly impact system performance.
there isn't a relay on xantias, the power goes batery to fuses then to stalk and splits then back to fuses then headlights, hope that helps
One can buy a used Citroen Xantia from sites such as Auto Trader, or use the Citroen website to find details of local dealers that have used Xantias for sale.