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sorry to hear about that.
I have just replaced the changeover valve today. now I can hear the valve. The EGR coolant temperature now is the same as coolant. No codes so far.
I had coolant consumption which was found on oil analysis ....nothing that changed oil viscosity but certainly need to be fixed. I had the EGR low pressure ( in front of engine replaced 20k miles ago ) inspected it and look good.
Just in case I removed the oil cooler, replaced all the gasket. Found broken transmission thermostat valve ... wont influence my coolant issue. At this point also replaced the auxiliary pump.
Decided to remove the auxiliary EGR cooler for inspection (next to exhaust manifold) and found this. Lot of coolant. Hopefully this explains the coolant consumption. Replaced it.
Now is time to put some mileage and hopefully confirm the solution.
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