That sucks. Just make sure you've checked everything before tearing it apart again. I mean everything, fan clutch, radiator, all those stupid little coolant hoses everywhere, tighten all hose clamps again, pressure test it and everything. The little stupid things are surprising sometimes with the ammount of trouble they can cause.
You can take some coolant out of your radiator or reservior, put it in a jar and bring it to a shop that has a gas analyzer (aka sniffer) diesel shops and emission testing shops should have them. Shake up the jar to release any trapped gasses and have them stick a "sniffer" in the jar to check for H/C's. You dont want to buy one, they're expensive. Good luck man, I hope it doesn't resort to the swap cuz thats just more down time.
Also, a bad coolant hose may not always leak coolant but can still suck in air during cool down periods, resulting in air pockets in the cooling system. Just a couple suggestions before going into teardown mode....again.
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