I wanted to share a little something that happend when i first got my bike. At about 1000 miles. I got a check engine light and red temp light. It happend very near the house so i was able to get it home. I called my bike dealer. They actually drove over an hour to come pick up the bike. It turned out the cooling system had an air bubble in it. The coolant was actually low.
It seems that getting the coolant properly filled can be a trick even using HD's fan/pump test problem proceedure. I can say that after the system was properly burped my watter bottle has not changed even the slighest bit and the bike has performed perfectly.
Moral of the story....don't forget to burp the baby.
Now at over 4800 miles and loving it.