Quote Originally Posted by pleasing05 View Post
Will try na ipaoverhaul yung radiator. baka po kasi nag"semento" dahil deep well po ang ginagamit kong tubig.
salamat po sa tulong...
Definitely your radiator. The mineral deposits in hard water can accumulate and clog the radiator passages. Not only that, it can also clog your engine's water jackets - around the cylinders, the thermostat housing, water pump too perhaps, as well as all rubber hoses.

Have your entire cooling system flushed with citric acid (low dilute concentration) to get all the mineral deposits out. Flush it until the water that comes out is clean. Just be warned that this could loosen any stubborn deposits and can cause a spike in the temperature when something declogs.

When done, fill it with coolant/antifreeze and distilled or deionized water if you have access to either.