(exhaust) – If you routinely fill the radiator or radiator overflow container, but cannot find an obvious leak near the front of the car, check your tail pipe. If you smell a sweet odor emanating from the tailpipe you could have an internal anti-freeze leak which is allowing anti-freeze into the cylinder and out the tailpipe. This type of leak should be fixed as soon as possible, as it can cause major damage to the internal moving parts of the engine if allowed to worsen.