My 650 is now 2 years old with 31,000 miles on it. I live in south Florida and for the first time my overheat light came on while sitting at a stoplight for awhile. I'm due for a coolant change in about 4,000 miles. The light did go out when I started to move. Does this mean it's hot out (which I know) 99* The coolant is low (it has never leaked) Or the coolant is ....wore out. Impossible. Can it be ignored for another 4,000 miles if I don't wait a long time at light signals?