Toyota Camry 1996 coolant overflow

[toyotacamry96-4cyl]

I recently changed the timing belt/thermostat/water pump of my car and strange things start to happen! My car is a 1996 Toyota Camry, 4 cylinder.

The reservoir of coolant overflows everytime I drive about 50 miles. (the coolant in the tank is way overfull and coolant is bubbling inside). The reservoir is about half full before I drive (so over filling the reservoir is not the problem.
Everytime when the coolant overflow, after the engine is cooled down, I open the radiator cap and find out there is no coolant in the radiator anymore!!!. So everytime, i need to refill the radiator!!!!

Here are other facts to help diagnose my car:
1) radiator cap is recently replaced so the overflow is not caused by a malfunction of the radiator cap
2) Everytime I refill the radiator after the engine is cooled, I did the proper steps (start the engine and let the air bubbles out). When I start the engine to let the air bubbles out, I also noticed that the coolant inside the radiator warms up really quick once I start the engine. It only take 1 min for the coolant mix in the radiator to almost boil!!!!
3) There are no leaking hoses of the cooling system.

4) The engine oil and the transmission fluid seems fine. (no mix of oil and coolant)

5) The fans work properly.

Can any one tell me what is wrong with my car? It is really annoying. Tried so many things to fix it but still do not kow what is wrong.

[UncleBob]

beyond something really screwy, such as the t-stat being installed backwards, it sounds like you have a blown headgasket

either the system is boiling or combustion gases are getting in there.