Zelandeth wrote: 04 Nov 2017, 00:54 Pretty sure on the HDi engined Xantia there's a plastic coolant elbow in that area that's prone to cracking after a certain age... certainly possible it was carried over to the C5.
Yes, that would have been carried over from the HDi's ancestor - the XUD... There's also an O Ring under the elbow that can go hard and leak too...