How to flush rust from my car cooling system?

[EVO-V]

So what is the best water?

Para sa iyo, Perrier. :D

[EVO-V]

sir EVO-V, para naman sa ikabubuti ng radiator ni TS, ano nalang ang ginagamit mo sa auto mo?
yun nalang gayahin nya para perfect na cooling system nya.

Our vehicles and equipment use the stock OEM long life coolants and fluids replaced at regular manufacturer recommended intervals, with the exception of a few test platforms. But if your vehicle has gone off this routine especially if you don't have its service history, it would be best to try and get back on the wagon by cleaning up and replacing with manufacturer recommended fluids at the very least.

Most problems crop up due to deviations from routine. Nothing wrong with deviations as long as they are sensible and tested.

Most applications aren't for extreme or extended duty anyways that is why its simply wise to stay within that conservative margin of sensibility.

[Chinoi]

If its just for flushing purposes you may use clean tap water. Its going to be drained anyway.

Drain old coolant into a pan or container. Do not wantonly discard this as it is toxic and harmful to the environment.

Then use radiator flush, run for 15-30 minutes, then replace with plain water, then run for 15-30 mins again, then drain. Repeat this until you're satisfied with the clarity of the water in your system, then drain and replace with your preferred coolant mix in and be on your merry way.

Newer cars with aluminum blocks and rads are more sensitive to water only application. So be mindful what you put in.

There is no mystique to this. Just commonsense science and diligence.

Thanks for the suggestion.