Just had my radiator overhauled last saturday. Yung ibang fins barado nga ng kalawang at kung ano pang particles yun. After the cleaning, binalik yung top, hininang and chineck for tagas. Then tapped it with 80% disltilled water + 20% coolant. Sabi ok pa naman water pump kasi kitang kita naman na nag cicirculate and coolant at walang leak. So I went for another long drive.

After driving for about 60kms to subic via sctex, sakto doon sa toll gate, pansin ko lumampas sa 1/2 yung temp up to 3/4, so i drove until I reached a safe place to pull over. Nung chineck ko yung radiator, nawalan ulit ng tubig! so I have to tap it with about 800ml of water. Same case when I drove back home, nawalan din ng water yung Radiator for about 500-800ml at napupuno lang yung overflow container at hindi bumabalik. I normally cruise at 80-100kph.

When I used the vehicle yesterday (Sunday) for about 2-3 hours of city driving (stop-and-go, traffic under the heat of the sun, quick accelerations, and speed not over 60kph), pansin ko hindi naman nag babawas. I'm quite puzzled at this point.

other observations:
-no traces of leaks when parked overnight
-no traces of leaks on the hoses
-in less than 2 minutes, temp easily rises to 1/2 mark when at idle during traffics.

Mirco hole on the radiator? Any other possibilities?