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This can be a indication of a leaking cylinder head casket, a crack in the cylinder head, sticky valve or a fuel injector. One will have to do a compression test to say what might be the problem. If the coolant level stay stable and does not need to be topped up all the time then the cylinder head should be fine and not have a crack. The other will reveal them self with a compression test.
This should answer your question but should you need more assistance please do not hesitate to ask as I can only make a assumption from the information that you give me.
Since the Routan uses a Chrylser engine, there are specific bulletins regarding this. Usually on the front head. They can burn a valve, and usually require a head replacement.
Let me have your VIN and I can look up the bulletin.