Q: Going broke buying coolant! on 1997 Oldsmobile Aurora

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
My car overheats when it is driven for an extended period or if it's really hot and it's idles in traffic. It does not actully get into the red but it runs hotter than normal. As soon as I park and turn the engine off all the coolant leaks out. It keeps happening over and over. I have replaced the water pump and radiator in the last few years. I've had all the hoses checked and had the thermostat changed out. There coolant doesn't leak out it all pours out as if something has busted but once the car cools down and I refill the coolant it might not do it again for a week or until whenever I get caught again in a little traffic. Help, can't afford the coolant bill!
(1) Answer
How about the radiator cap, Has it ever been changed as its a 15 PSI rated cap and if it can't hold pressure it will purge coolant out when hot. Don't change this cap when the engine is hot as hot coolant will burn
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