Hi all not sure if this will help anyone
I was chasing a coolant leak replaced all the hose clips with jubilees and still leaking. Pressurised cold and it held pressure - warm it lost pressure found it an ali union elbow at the entry to the heater matrix had corroded replaced and all good

Nice find, Sandy.

Was it a bad job to change? 2002 4.6 Vogue SE - Alveston Red with Lightstone Leather
2012 Range Rover 5.0 SC Autobiography in Indus Silver with Jet/Ivory Interior
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Hi David
Not really the hard bit was finding it I pressurised it a few times when it was cold and left overnight first time I had a couple of the hose clips letting by so changed them - second time had a joint on the entry into FBH ( mine is odd one of the few petrols with FBH ) so of course thought cracked it and of course I hadn't.
I happened to speak to an indi near me and he suggested the elbow and bingo took about an hour and a half to do as it is at the back but just a steady plod.