Does the. Manual give any coolant instructions at all. Some engines require venting or burping of coolant lines. Does it use a coolant filtercontainindspecial additives?
Here's an image of "Cummins QSB drain plug"
Your 380 could be different that whatever model that one is:
(Edit- sorry the link was too long and didn't display so it was deleted, but just google the above if you care to see it. )
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