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They'll probably say that it will void the warranty or something stupid like that (cause they always do). I say block it off slowly, starting small at first, and watch the temp gauge. If they coolant is good and it's winter, it should be totally fine. Your engine will probably thank you, because diesels are known to be hard to start in the winter (ei. this is why some people buy block heaters stock with their diesel) and the blockage of freezing air will cause the heat to stay in the engine bay and warm the engine faster, and keep it warm. You'll get the heater to heat faster too.
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