Just a small clarifications on this so there is no confusion!
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The oil cooler is on the RH side of the engine. behind and below the thermostat housing, and behind the water pump, bolted to the block. Water fittings are external. Oil passages are sealed by the gasket between the cooler and the block. Papaindigo has a photo image showing it clearly, but I can no longer link it.
Only
one of the coolant fittings on the oil cooler is external and that is the coolant outlet from the cooler back to the water pump suction. The oil cooler gets its inlet cooling flow from the block via an internal passageway into the cooler just like the oil passages are plumbed.
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Since my EGR is inactive thanks to GDI tune, I presume its cooling lines should be safe to "short circuit" bypassing the unit, no? This way the coolant will still be left flowing in the name of reducing potential for extra bubbles. Even with a GDE tune, as long as it's still actively plumbed, there is still potential for leakage between the exhaust and intake (both are pressurized with potential to go either way) when the FCV plate fails to close completely.
The FCV butterfly plate, if you still have one, closes down during certain times of engine operation to produce a low pressure zone in the intake so the EGR valve can dump exhaust gases into the intake. Being this is a turbo boosted engine, this has to be done to get the intake pressure low enough to be able to get the EGR gases to flow into the intake.
NO electronic tune can 100% guarantee that an EGR valve will not leak by in either direction and allow leakage of exhaust gases or boost back to the exhaust manifold.
That is way I also tell people if you simply are going to blank-off your EGR feed line, it is best to remove the butterfly plate out of the FCV so it cannot impede air flow into the intake manifold!
Of course installing a Weeks elbow kit gets rid of all of these possible problems!
As to the EGR cooler coolant lines; I have a big concern about how this was designed! It is pulling very hot coolant out of the center of the head
BEFORE the thermostat ever senses it, runs it through the EGR cooler (which may actually be a heater) trying to cool down exhaust gases that could be in the neighborhood of 800 degrees post turbine or more and then dumping this very hot coolant back into the suction of the water pump. So this coolant flow bypasses the radiator completely.
Am I the only one who sees a problem with this design???
Most external EGR coolers dump back into the thermostat outlet or directly into the radiator inlet...
This is Pap's good photo of the right hand side of the engine showing clearly the engine oil cooler:
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