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The Japanese small diesel engine designs have many advantages in general. Unfortunately, they are not very forgiving when overheated to much of a degree. Your history of running a bush hog with a plugged radiator AND a possibly faulty water pump at the same time, running it until it blew out the...

No, you should run it awhile and see if it opens on it's own. There may well be nothing wrong with it.

In theory what you're describing seems pretty normal. Coolant shouldn't flow into the top radiator hose until the thermostat opens. That won't happen until it runs for a while.