For what it’s worth in this rather divergent thread, my “overheating” problem turned out to be a blown head gasket. When your coolant is “boiling” and shooting out through your reservoir cap, your engine must be overheating, right? Nope! Make sure you’re not dealing with a blown head gasket before you start replacing your entire cooling system without solving the problem. If you’re having what presents as overeating problems, get yourself one of those coolant “sniffer” kits that checks your coolant for engine compression gases so you know for sure. The funny thing about a blown head gasket is that eventually enough coolant will be lost through overpressurization of your cooling system and you WILL overheat, very quickly and catastrophically. Beware!
Also for what it’s worth, I’m a fan of keeping things stock. I have a Wolf 90 with the stock 300tdi. The Wolf came from the factory with the heavy duty all-brass radiator as sold by RN. My original radiator had some leaks that I could not fix, so I replaced it with an all-brass replacement from RN. Very nice. While I was at it I replaced the heater core and all the hoses to ensure I was starting fresh. I live in Tucson, Arizona where summer temps get above 110 several days each year, and above 100 for weeks at a time. Mine’s a daily driver, and once per year I take it out in August for a four-day camping trip near Yuma with a buddy of mine for our annual Heat Treatment adventure. No AC, and last year it got up to 113! Let’s just say we spend a lot of time looking for shade and sitting around drinking cool drinks. 220 miles each way on the freeway and about 100 miles tooling around off-road. She runs cool as a cucumber. The stock cooling setup works just fine, but if you try to make your Land Rover into a hot rod I can see how you might run into problems.
On another note, I also added RN’s excellent VDO speedo and 3-gauge setup (speedo, fuel, volts, temp). They hooked me up with 24-volt gauges for the Wolf. Pricey, but awesome. The stock temp gauge sucks weiners (since we appear to be on the subject of weiners), and the VDO gauge actually tells you what your coolant temperature really is in degrees rather than the nebulous when-should-I-start-to-worry stock gauge. I never get above 210, even in all that heat.
That’s what’s worked for me. Your experience may vary!