C5 "exclusive" Estate (53 Plate) Completely Sinks Overnight

[Weebachle]

Hi All,

For the past week or so my estate sinks down completely overnight, till the wheels are buried in the wheel arches.. Opening the car doors or starting the engine quickly brings the ride height back to normal. Through reading topics on this forum I have found mention of  "anti-sink Reservoir" and "anti-sink-valve" but I don't know what they look like or where they are physically located on the car. Also the Haynes C5 manual I just bought does not seem to mention either of these anti-sink devices. There are NO apparent leaks under the car.  As an Senior Citizen with limited funds, expensive visits to main agents have to be avoided! I am prepared to tackle most mechanical repairs but the Citroen suspension system is a completely unknown item to me.

I would be extremely grateful if any of the lots more knowledgeable guys out there could suggest the most probable cause(s) and if possible a (non main agent solution) to this problem? 

Many thanks

Graeme

[paul.h]

Sinking rear end could be worn seals in one of the rear struts. Check the front struts for oil leaks down the outside of them but a slight smear is normal.

[chuckie]

I had this problem a couple of years ago which the dealer thought it was a steering problem as a fault code suggested, this seemed strange to me so after many weeks of looking for leaks I found the seals as suggested had failed and the fluid was simply returning past the seal to the reservoir without any signs .simply by pulling the returns off before the car sinks you should find the right side .It cost me £118 for the strut and £54 labour at centreville in Newcastle uk I hope this helps