Is It possible for water pump to be not working?

I have just cleaned again the radiator and I used blower fan to removed all the liquid. After filling it again with water, I switched the engine on with AC on, after 25 minutes the temperature reached to 100 degrees celcius. I turned off the AC and I turned off the engine, with the engine hood opened I observed what happened, the coolant reservoir was filled with boiling liquid and finally spilled most of the liguid until it stopped to "FULL" line.What is the real meaning of this?

Still having the problem huh? I think if you have done everything he have talked about already then you should take it in to a shop. It sounds to me your ac is overcharged, restriction in ac system, causing the condensor to get too hot. if you have air flow through radiator and condensor that is what i would do

I went to the shop for checking the car on the computer and it says "Camshaft to Crankshaft position correlation fault". They told me to tune up the engine because timing has a problem, they that's why it's overheating because the engine is not working well. Shall I go ahead and let them open the engine?

By the way it will only overheat if the AC in on.

Code P1345 this is the reading from the PCM.