I'm on my 5th XJ petrol.
All standard Cooling systems save for the Auto transmission cooler separated from the Radiator.
None over heat and I run AC 24/7 and live and work in Northern Australia.
If your over heating then you still have a issue some where in the basic system.
I tow in sand with a tail wind and still don't over heat.
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Townsville, Do drop in.
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