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That is the combination of Dexcool and air. Which is why Dexcool is only good in a system that will never leak or have air introduced in any way. The TBH probably once had a small leak.
I use the BMW blue coolant. This is a relic from the PO. We just got this Disco a month ago and this week I've been working through the major service sticky.
When you replace grab a Genuine kit. I reconditioned the gasket contact surface with 180 then 220. Seems to have worked beautifully. I have heard people just seal using The Right Stuff, but I have not tried it.