In the back of your manual is a set up check list that New Holland requires it's dealers to go through with you, the new owner. My dealer went through the whole list one at a time, in fact it was even boring for me. At the end, he told me New Holland requires this to be signed by the new owner. I would call back and say, Hey, who put all the hours on this? and I am not happy about the way it was dropped off. Give me a good reason for why all these hours on are this tractor or come back and get it. Now, I do believe this came up once before about the hours on a newly delivered tractor and if they did run it through a full test and using a dyno it could have ran up to ten or so hours. I would not know how to do the search for the thread but I am sure we had a thread on this before.
The half empty radiator would tick me off, as far as overheating I am not sure I would worry too much about that if they used it for a demostrator just running around the lot, but if they actually did put it on the dyno where they run it hard for a while then I would be. All in all if it was me I would be disapointed and I would let the dealer know in writing along with a phone call and a registered letter to New Holland.
murph