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I thought he said there were NO external leaks before changing the engine - think it might be wise to take it some where and have a pro put a pressure test - or at least look at it?......changing the engine is no fun,,,,,, maybe put some flourscent die in the coolant and use a black light in...

why was air leaking from around the test cap?.....could it be that the radiator fill neck is dirty or deformed and the radiator cap isnt sealing on it?...if so neck might need replacing at radiator shop fix all the leaking clamps - inspect/clean the filler neck and try the press test again -...

dont click on any of the links from above post ------I just cut and pasted - dont know why the highlighted links appeared:sad:

Cavitation in enginesEdit Some bigger diesel engines suffer from cavitation due to high compression and undersized cylinder walls. The result is pit holes in the cylinder wall that let cooling fluid leak into the cylinder. It is possible to prevent this from happening with chemical additives...

if its puking coolant - must be getting pressure in the cooling system from either a bad head gasket - or maybe some cavitation holes in one of the cylinders -----since you just got the truck you have no idea if cooling system was properly treated to prevent cavitation damage. got to a shop...