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 the 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.

Does the temperature gauge rise above normal? Did you turn on the heater when you let it run to bleed air out?

Thanks for your respond. The temperature is ok but fluctuate a lot. For example, the temp gauge takes way longer to show the normal temp (temp gauge in the middle). It took about 5-10 mins for the temp to be normal before I have this cooling problem. Now it takes way longer. And another thing I noticed is that as soon as I get on the high way, the temp drops to the bottom of the gauge and as soon as I get off the high way, the temp goes to the middle of the gauge. The temp fluctuate a little before but not as much as now.
I did not turn on the heater as I refill the radiator.

I had a similar problem with my 95 after changing the water pump and thermostat.. When I got on the highway the temperature would drop. I changed out the thermostat again and the problem went away. Double check that you have positioned the thermostat correctly.

Thanks a lot JennyDee, Do you also have the same problem with the cooling system after you changed the thermastat the first time?

All things considered I'd have to go with a thermostat problem. It might even be installed backwards. Hey, we all make a bad move now and then. Make sure it's the correct temperature rating. Beyond that, I'd suspect the pump, new or not.

http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c152800743a2 Scroll down to the 4 cyl installation.