I'm not getting any overheating problems but I notice that whenever I'm parked up (engine not running) my fan is really tight. You can just about turn it with two hands and a good bit of effort. However when the engine is running it spins...
There's a lot of advice going around from around 2006 or so, when you could buy a rotten Discovery with a decent enough 200tdi in it for not much money. Park the cars next to each other, lift the engine out and put in your old 90/110 relatively...
I have a 19j diesel in mine which is my every day car and I don't really feel the need to change it. I think the purist in me would say keep it original 😊