Ok,Thanks for your help guys!

If by blocked you mean the hole doesn't exist on that port, then it's fine and you can leave it. The updated radiator design is supposed to be like that.

The hole is there, but it's clogged. I think the radiator isn't original and the previous owner replaced it. And I think he made a mistake. So I'm wondering how the oil cooler water circulates if this hole is clogged.

Hello Sierrafery, I'm asking about a problem with my Discovery TD5. I have a 1999 10p engine. I've removed and cleaned my radiator. I noticed the hole coming from the oil cooler is blocked. Can I leave this setup on this model or do I need to...