Paul, well said. However, there is nothing wrong by adding an overlfow tank, since its so easy to do. Granted, if there is a consistent overflow problem, there is something wrong that needs to be fixed. However, there may be occasions where an overflow may occur while everyting works well. Say, after a high speed run you have to come to a complete stop. Even if you keep it running, it may still try to overflow. Why waste coolant? Also, in the winter I always put carton boards in front of the radiator to help the engine warm up faster and run a bit warmer (back in the old days, this may have been undesirable, but motor oils are so much better now, so it is actually better for the engine to run 10-15 degrees warmer than cooler, especially in the winter). Then, we may have a warm front, and I may not remember to remove the board. Why waste the coolant? D^2 Quoting RandalPark@xxxxxxx: > Hmmmmmm...I would say that the cars that you are speaking of may have had > unmaintained cooling systems. Also, in addition to overflowing, those cars > could also have had low coolant levels due to a minor leak someplace in the > system. An overflow kit would not help that problem. Aside from that, water > levels are suppose to be checked regularly. ....