Over 2 XJ diesels I have never replaced one. As they have alloy heads, the heads corrode away first.
The biggest issue you will have if its been run with tap water for a long time is precipitation of aluminum hydroxide in the radiator. The red color you see in the water is not conventional rust. Its Aluminum hydroxide. It is less soluble in cooler water so as the water cools in the radiator, it forms scale in the core.
Lowering the PH by adding vinegar will help dissolve it. Citric acid is often used. I have heard of flushing the radiator with steam/boiling water as well. Inhibited sulfamic is a common cooling system cleaner. Many flushing additives are based on it.
I now run my cooling system with corrosion inhibited water and without pressure. Works well. probably if I pressurized it there would be leaks in the radiator everywhere. The system I have set up looks a bit agricultural.
Probably not a good idea in cold climates though.
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