I just returned from a 2000 mi trip on my trusty 1989 Venture. I was close to Canada so the mornings were chilly! Each morning when I would get to the bike there would be a spot, about the size of a small plate, of antifreeze under the right side of the motorcyle. I would top off the expansion tank and about 5 minutes later the leaking stopped and would not appear until the next morning. Now I am back in the Midwest and it has not leaked a drop since I returned. Any ideas?