same story with my Honda City 1999 model... At one point, hubas jud ang radiator... I did check everything... Radiaotor, hoses, etc... And it seems wala problema dira...
Then nawala for about 2 weeks, then hubas na sad... My problem that time was the water pump... I am so lucky that I did not screwed up my head gaskets and cylinder heads...
Im a little bit hesitant to drive the car in longer trips, and decided to sell it for good...