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Yes
The antifreeze provides corrosion protection until the corrosion package is " used up " and it raises the boiling point and lowers the freezing point of the water
No. The antifreeze has to be mixed with the water before the water freezes.
Water can be used in an emergency but there is no corrosion protection like a mixture of antifreeze and preferably distilled water ( until the corrosion protection in the antifreeze is " worn out " ) Also , adding just straight water will dilute the antifreeze so the temperature at which the mixture freezes will not be as low
50% water and 50% antifreeze.
You don't put water in your radiator, you put antifreeze.
It is no longer necessary to add just water to a radiator in newer cars like the 2005 Malibu. An antifreeze that is half water and half antifreeze is usually best. Add the 50/50 antifreeze to the radiator overflow tank. It should be a plastic, see through tank hooked to the radiator.
the water in your radiator is rusty because your antifreeze/water ratio is not correct. Antifreeze serves two important functions: protecting the cooling system at temperature extremes and inhibiting rust and corrosion in the system. When your antifreeze/water ratio is not correct Rust and sediment can accumulate in the cooling system. This can eventually clog your cooling system mainly your radiator and cause your car to overheat, and more serious problems with the over heating. I would suggest flushing your system and adding the correct antifreeze/water ratio mixture. Doing this your self or having it done by proffessional.
the antifreeze runs through all your water lines in your car . . . . you put it in your water tank or radiator
It lowers the freezing point.
50/50
water can freeze. anti freeze can not.