Water pump. FAIL

[Quijote]

To repeat what was stated earlier... flush the coolant out. Green does not play nice when mixed with the OEM orange stuff. Do a couple of flushes with water if necessary. Google for more info on what happens if you mix green with Dex-Cool (which is basically what the LR stuff is, more or less).

FYI, the genuine Land Rover antifreeze from the dealer was not that expensive when I last bought some a couple years ago. Worth it for peace of mind on an engine that cost $5-$8k (plus labor!) to replace with a used one.

Agreed on both counts. Flush the hell out of the system and the LR factory coolant is not expensive enough to take the chance IMO.