I have yet another problem with my 2007 t600. With coolant it is bumped to … 6. Broke my cam in tonight finally wrapping this mess of a project up. The reason being the boiling point of water/coolant increases as pressure goes up. The radiator system is under pressure. It started pushing coolant out of the overflow tube yesterday. Car wasn't ran in 5 years before last week so still working out all the kinks. 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. This helped me flushed any debris that may have accumulated in the system. Followers 1. 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. Also check the thermostat. 4.while leaving the radiator return hose disconnected, continue filling the raditor wlth water while the engine still on. I had my rad cap pressure tested & it failed so I put a new one on but it is still doing it. It is being blown out of the tube on the overflow tank. Truck has had a small coolant leak for a few months now. Its never done this before. I have no other issues with how it runs, no overheating, rough running, etc.. Check your radiator cap. Ok I need HELP!!!! 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 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 … 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. Usually the cap is designed to release between 14~16PSI. Towed the camper last weekend & she was overheating quite bad. The motor is not running hot as the temp gauge stays right in the middle and have checked the sensor and it works fine. My 1999 Ranger with a 3.0 V6 is pushing the coolant back into resavoir and out of radiator. Pushing water out of the radiator cap Sign in to follow this . With plain water this works our to ~250degrees. Replace the hose from the bottle to the radiator. 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. I then add about a gallon of coolant … 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. 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. 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