Its never done this before. Truck has had a small coolant leak for a few months now. The reason being the boiling point of water/coolant increases as pressure goes up. Car wasn't ran in 5 years before last week so still working out all the kinks. Broke my cam in tonight finally wrapping this mess of a project up. Also check the thermostat. Ok I need HELP!!!! Usually the cap is designed to release between 14~16PSI. 4.while leaving the radiator return hose disconnected, continue filling the raditor wlth water while the engine still on. I added some to it about 2 weeks ago and i might have overfilled it, but i have added it before and its never pushed it out. It started pushing coolant out of the overflow tube yesterday. The motor is not running hot as the temp gauge stays right in the middle and have checked the sensor and it works fine. 5.Removed the overflow tank and cleaned properly. This helped me flushed any debris that may have accumulated in the system. I have to be super careful taking the cap off, because there is so much pressure building up that it will blow the cap out of the air and shoot a geyser of coolant 15' in the air. Pushing water out of the radiator cap Sign in to follow this . Followers 1. Replace the hose from the bottle to the radiator. I then add about a gallon of coolant … It is being blown out of the tube on the overflow tank. Thank you everyone for your posts…The car is NOT over-heating at all, and the hoses are hooked up correctly to the reservoir tank. My 1999 Ranger with a 3.0 V6 is pushing the coolant back into resavoir and out of radiator. I agree with your general consensus to change the radiator cap, perhaps the excess pressure is whats pushing all the coolant out of the reservoir. I had my rad cap pressure tested & it failed so I put a new one on but it is still doing it. With plain water this works our to ~250degrees. I have yet another problem with my 2007 t600. With coolant it is bumped to … I filled the radiator with just water for the break in since I assumed I'd have fluid running all over the place and might need to take the radiator … Towed the camper last weekend & she was overheating quite bad. Check your radiator cap. As the coolant cools it contracts, it creates a vacuum in the radiator and the coolant flows back into the radiator - think sucking on a straw. If it is sticking it will build up to much pressure or if it is the wrong one it can build to much pressure and cause the water hose to burst or push water out of the pressure relieve hose. So I pulled the rad & cleaned it up & she is running cooler but now it is blowing coolant out the overflow on the overflow tank. I have no other issues with how it runs, no overheating, rough running, etc.. 6. The radiator system is under pressure. 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