Originally Posted by rider384
I haven no overfill tank since I just run strait water. The hose just pisses on the ground, which is why I know it's coming from there and exactly when it happens.
Are you ******* trolling? This is probably some of the stupidest **** I've ever heard. I covered this **** in 6th grade physics class.
The overflow tank is not there to keep toxic antifreeze from falling on the ground, it's there to keep fluid in your radiator, dumbass
When fluid heats up, it expands. When it expands, it has to go somewhere. The radiator cap is not there to keep water in the radiator, that isnt possible. Liquids are uncompressable - that is to say, it's entirely impossible to take one liter of water, apply 100 Bar of pressure, and expect it to physically occupy less than 1 liter of space. A barometer submerged in the fluid, will however show the pressure increase, and the walls of the container will experience the pressure increase as well. When your coolant heats up, of course the pressure goes up, but it also needs a way to escape. As far as the liquid is concerned, we could just have an overfill tank with an unpressurized radiator cap, and the liquid would be happy all day long exiting the warming radiator, and then reentering the cooling radiator.
The pressurized radiator cap is simply there to keep the coolant from boiling - nothing more.
So, to recap:
Water heats up, radiator pressurizes as water expands. The hot water must physically occupy more space though, so it goes out the overflow tube to the OVERFLOW TANK. The entire cooling system maintains pressure equivalent to what your radiator cap allows for, this prevents boiling coolant.
When the water cools, it contracts. Since the same mass of colder water must occupy LESS space, your radiator quickly falls below atmospheric pressure, and water is drawn back into the radiator from the OVERFILL TANK through the radiator cap.
Solution to your problem: Reinstall a damned overflow tank.