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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 to leak out of the expansion tank outlet hose? RECENT REPAIRS: Heater Core Radiator Radiator/ Reservoir Cap Thermostat TESTS: Cylinder Compression Test (all 8 cylinders at approximately 160 psi) Coolant Pressure Test (maintains 16 psi of pressure for a long period of time and no visible leaks) Cooling Fans (both fans are in working order) Water Pump (circulates coolant throughout the engine) MISCELLANEOUS INFO: No white smoke comes out of the tail pipes Smooth engine idle No milky oil Clean Dex-cool antifreeze