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There are many things wrong with Exhaust Gas Recirculation (EGR) for diesel engines, not the least of which is the fact that eventually the corrosive hot exhaust that is being recirculated will eat through the coolant jacket and your engine coolant will disappear out the exhaust pipe. This can be quite rapid: I found my engine coolant level went from full to almost empty in just 10 minutes and the temperature gauge was right at the top. If I hadn't stopped the car, let it cool and filled it up again my head would have been wrecked (unless the computer shut down the engine to protect it...)
Other problems with EGR include: worse economy, (forcing the car to burn more fuel and create more CO2 pollution in order to reduce NOx emissions), dirty intake mixing with fuel to clog up your intake manifold and stop your sensors reading correctly, dirty mixture in the cylinder head adding particles to the sump oil... It really is a STUPID idea!
Anyway I solved my overheating problems by disabling the EGR solenoid valve and rerouting the coolant tubes connecting the input directly to the output and bypassing the EGR cooler altogether. Success!
You can't just leave the EGR off altogether as shown in this video, you will need to make a steel blank to mask off the exhaust port, or you can just put the cooler back on to cover the port but leave it bypassed.