I had an unexplained coolant loss earlier this year with no sign of a leak anywhere.
Done a pressure test and it was losing pressure but very, very slowly.
I was expecting the worst but then decided to remove the undertray, checked the following morning and sure enough there was a slight sign of pooling adjacent to the front offside wheel arch.
Removed the wheel arch liner and there are a couple of aluminium cooling pipes behind it and one had a pinhole in it.
Done a temporary repair by splitting a piece of rubber hose and clamping it around the pipe where the pinhole was.
Sure enough the leak stopped which was a huge relief as I was worried it may have been head gaskets!
Ordered the wrong pipe - I believe it is listed under HVAC and not cooling and once replaced the coolant loss stopped completely.
Hope that helps?
-=Glyn=-
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