When I did mine last weekend, the service manual gives a procedure for refilling the coolant. I drained about 1 gallon and only a small amount drained out of the EGR cooler.
Here is the process from the 2017 service manual... without all the warnings about how bad coolant is for you if you drink it, how you should make sure your hoses are connected, etc, etc.....
07 - Cooling / Standard Procedure
FILLING – 6.7L Diesel
1. Close the radiator drain plug.
2. Using
Funnel 8195A , fill the cooling system with coolant mixture (Refer to 07 - Cooling/Engine/COOLANT/Description) .
3. Add coolant to the overflow bottle until the level reaches the top of the fill neck. Then, allow the coolant level in the overflow bottle to settle for 90 seconds. Check level again and add coolant if necessary for the level to reach the top of the filler neck.
4. Install overflow bottle cap. Start engine and idle for 2 minutes. Shut off engine and ensure the coolant level is at the top of the overflow bottle filler neck. If coolant is added re-install the cap.
5. Start the engine and with the transmission in park and/or neutral, operate the engine at 2000 RPM. Monitor the coolant temperature on the EVIC. Once the temperature has reached 200° F, continue to operate the engine at 2000 RPM for 10 minutes, then shut the engine off.
6. After the engine has cooled check the coolant level. If coolant level is below the 'full Cold' marker, add coolant.
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