Note, I haven't gotten my car to the repairs yet cause I finish work around the time my mechanic closes his shop.
Last night, while driving home 3/4 of the way (total of around 15~20 minutes to reach home), I noticed my temperature had reached its peak so I assumed the water is boiling and I stopped my car immediately in case my gasket gets blown or something.
Funny enough, after waiting for 5 minutes, the temperature returns to normal once I start my car again. Started driving and the temperature slowly rises again. Stops for 2 minutes, started the car again with normal temperature. This repeats for 2 more times until I reached home finally.
The radiator fluid is still full. I just want to know the general cause it might've been before I hand my car to my mechanic.