EGR Coolers

BT50s and Rangers with the 4 cyl. 3ltr turbo-diesel engine have a history of cooling problems, my research indicates that the exhaust gas cooler (EGR) is often the cause with the probable scenario being as follows.
Exhaust gas is recirculated into the engine inlet air to reduce exhaust pollution, as the gas is very hot it needs to be cooled first, so an EGR cooler is fitted. In this case the cooler is poorly designed and should be considered defective/faulty. There is only a small coolant flow through the cooler and this may be OK for average engine loads. The coolant is already hot as it flows from the cylinder head to the cooler, not from the radiator. But for long brisk drives, hot weather and heavy loads, or when the is radiator partially blocked, the exhaust gas entering the cooler is so hot that the coolant boils and vaporises halfway through the cooler. Like saltwater when the coolant vapourises small solid particles remain in the coolant flow path. These particles eventually collect in the top tank of the radiator progressively blocking the cores, the thermostat opens to counter the loss of cooling in the radiator. Reverse flushing of the radiator may clear the blockages. In the worse case the lack of coolant flow in the EGR cooler, due to it vapourising, results in the internal metal of the cooler failing allowing exhaust gas at higher pressure and temperature to flow into the coolant system ( similar to a blown head gasket or cracked head ), resulting in instant engine overheating and boiling, plus fairly costly repairs. The overheating can cause damage to the cylinder head and injector tips which are both very expensive to repair and may involve further problems.
Put simply at high loads the coolant flowing into the cooler is too hot and the flow too small to effectively remove the heat in the exhaust gas, the pollution control effect is minimised and by adding heat to the intercooled air entering the engine, engine power is adversely affected.
I have put these details to one of the manufacturers but they refuse to comment on the technical specifics and the nature and cause of the problem, they merely say that the vehicle was out of warranty and the repairs were not carried out by them. The absence of any rebuttal or comment on this sequence tends, I think, to confirm its validity. Other manufacturers are currently replacing air bags on cars well out of warranty.
Talking to spare parts suppliers, reviewing various search engines, forums and youtube indicates how common the EGR problems were with these companies plus others. The number of EGR coolers sold by dealers and replaced by repairers supports the contention that these vehicles should have been the subject of a recall &/or compensation payments to owners