^^^ Nasagot na ni v6dreamer yung sa flushing. In addition, they normally use a radiator flush (Whiz, Abro or Prestone) to efficiently remove particles inside your radiator.

Re: radiator overhaul, in the local setting, tatanungin ka muna kung top or bottom overhaul. Kung top, yung upper part yung tatanggalin, lilinisin ng acid (basically stripping away the paint), tapos dudutdutin yung mga holes with a flat metal rod (converted oil dipstick yun) to declog it. Kung bottom, yung bottom part ang lilinisin tsaka dudutdutin. Kung general overhaul, both upper and lower parts are removed. Tapos, leak-test na nila kung walang butas (sometimes manual sila, bibig ang ginagamit pagbuga ng hangin). Sabay salpak ulit sa car. More or less, 1.5 hours ang proseso.

Bihira silang mag-pintura ng radiator dito pag overhaul. Madalas kasi, sa tabi-tabing radiator repair shop ako nagpapagawa. Don't know about the larger ones though.