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. 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. It is being blown out of the tube on the overflow tank. 5.Removed the overflow tank and cleaned properly. I then add about a gallon of coolant … This helped me flushed any debris that may have accumulated in the system. It started pushing coolant out of the overflow tube yesterday. 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. Broke my cam in tonight finally wrapping this mess of a project up. I had my rad cap pressure tested & it failed so I put a new one on but it is still doing it. The motor is not running hot as the temp gauge stays right in the middle and have checked the sensor and it works fine. With coolant it is bumped to … I have no other issues with how it runs, no overheating, rough running, etc.. My 1999 Ranger with a 3.0 V6 is pushing the coolant back into resavoir and out of radiator. Ok I need HELP!!!! Check your radiator cap. Towed the camper last weekend & she was overheating quite bad. 4.while leaving the radiator return hose disconnected, continue filling the raditor wlth water while the engine still on. Also check the thermostat. 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. Pushing water out of the radiator cap Sign in to follow this . 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. I have yet another problem with my 2007 t600. With plain water this works our to ~250degrees. 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. The radiator system is under pressure. 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 … 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. 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. 6. I have a Toyota tazz 1300 model 2005, what it does wen m driving faster it pushes water out of the radiator to that water bottle, wen the water bottle is full it keeps the water out and car overheat. Truck has had a small coolant leak for a few months now. Its never done this before. 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