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Hello, I am looking for help to solve an overheating problem on my 1996 Cadillac Eldorado ETC. The car reaches operating temperature in a normal amount of time. It Does not leak coolant or overheat while idling. It does not leak coolant or overheat at freeway speeds. However, the car does leak coolant and then overheat in "stop and go" traffic or areas with frequent stops or red lights. The overheating is caused by a loss of coolant leaking from the expansion tank outlet hose. If the car is refilled with new coolant, it returns to operating temperature. My question is what causes the coolant