IMHO what starts this sequence of events are small leaks on top of the motor from the distribution pipe and-or the hoses off the back of the water pump. When the owner eventually lets the level get too low air gets into the system and is never properly bled out. The way to avoid this is to replace all hoses and seals. The continuous bleeder is a good idea but really isn't required on a car that has a tight system with no leaks. It can be done but it requires a lot of work to make the system completly tight. Another little thing I have done (but not on Deloreans) is to drill a small (1/8) hole in the plate of the thermostat so it can pass air. This helps on other cars so it might work on Deloreans but I have never needed to do it as on a tight system once you bleed it it doesn't have any air inside to pass. If you are still driving on origional hoses and water pump then you are just asking for trouble, never mind about a little air. For any owners who have to add coolant be warned that this is a signal of a serious problem. You will never see the lost coolant on the floor because of the way the leaks leave it on top of the motor to evaporate. David Teitelbaum vin 10757 --- In dmcnews@xxxx, "IN2TIME" <Gary@xxxx> wrote: > I often hear about how someone's car got low on coolant and "got a bit > hot". They put some water in the overflow tank and the next time they > drive the car, it overheats again, and again, and again. Often they > explain that "at least the gage never got above XXX degrees". If they