mga paps i just need help with my radiator problem.almost 1 week na nito pinapasakit ulo ko

last week kasi i noticed na nauubos yung water sa reservoir ko,so upon checking,i saw na may leak yung bottom part ng radiator which means may butas,so i had it repaired,ok na wala na leak,kaso 2 days ago,while driving from makati to paranaque with ac on,wala naman overheat pero nung naisipan ko ihataw nung lumuwag ang daan with the ac off, i noticed that umangat yung temp like 2 lines above the middle/normal part,so what i did was i turned back on the ac,and bumalik sa normal,when i got home, i turned off the ac and revved the engine up to 4k rpm twice,bigla na naman umangat yung temp pero once i opened the ac,bumalik sa normal,so i figured it maybe the rad fan, i checked the switched,ok naman,and then yesterday,tinesting ko,with ac off,traffic,from paranaque to mckinley hills taguig paikot ikot,wala over heat , then bumiyahe pa ko from sucat to trinoma and back wala pag angat ng temp, tand rad fan works ok nag aautomatic siya,then today i opened the rad cap, i noticed nabawasan yung tubig sa rad,so nag add ako ng mga isat kalahating baso,pero yung reserve na lalagyan,hindi nabawasan,i cant see any leaks from the rad,from the hoses to the bottom part,as in wala,i replaced the rad cap na pala and the hose clamps and visually checked everything pero wala talaga ako makita leak,chaka bakit hindi nababawasan yung reservoir ko di ba dapat pag naubos ang tubig sa rad sa reserve siya hihigop para puno parati yung sa rad,?bakit nababawasan pa din yung radiator ko?

sorry kung mahaba ,all inputs will be appreciated,thanks