Did you listen to the radiator too see if it gurgles when filling? When filling the gurgling tells you there are no air or coolant leaks in the engine much the same as an upside down soda bottle gurgles when turned upside down. Also look in the radiator too see if bubbles are coming from the bottom of the radiator while running at normal operating temperature with the cap off.? If you see bubbles coming from the bottom, you have a leaking head gasket. This can and will happen without the coolant leaking into oil, and without oil leaking into coolant. The gasket leaks right near the cylinder and sucks the coolant into the cylinder on the intake stroke, and blows it back into the radiator on compression stroke. This is why the coolant bubbles up from the bottom. The coolant that gets sucked in gets vaporized and comes out the exhaust. Loosing coolant ?? This is where it is going if no leaks under or around around the vehicle.Good luck I hope this solves your problem. Please post a solved comment on fixya, so I receive credit for the solve.
The head gasket or the intake manifold gasket has failed.
Possible head gasket
The Vehicle Has a Blown Head Gasket that is leaking into the exhaust port of the Vehicle.
SOURCE: overheating from leak not visible
Hook up a cooling system pressure tester. If you have a pin point leak, the pressure from the tester will shoot coolant out of the leaking area.
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