Yes. The best to use is of course is a mixture of water and coolant but just water will work fine in your vehicle. Add coolant when you can get some for the best cooling.
But only temporarily in an emergency. Water alone was fine (when the temperature stayed above freezing) back in the 1950s, but today's engines need the rust inhibitors and other additives.
if at all possible you need to use anti freeze but water is ok to use in a pinch
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I would only put water in an emergency situation where I don't have coolant available. The coolant helps the engine to not overheat and to not freezing, while that could happen if you just use water. If you don't have your vehicle's manual to know the specification of the coolant, you can use the generally available Prestone and add water according to the table on the coolant's recipient. (or you can buy the pre-mixed formula)
as long as it is not the winter... then it will freeze. and never put water in a hot empty radiator or you will crack the block and you will be very sorry.
use half coolant and half water
Distilled water mixed with antifreeze ( usually 50 / 50 , Ford says up to 60 % antifreeze in colder climates )
Only use BMW coolant and distilled water.
Use only Honda Coolant unless you want to replace the water pump which will be damaged if you use any coolant with sliicates in it. Also use distilled water not tap water. Honda sells a premixed coolant for around $5 a quart. Money well spent.
The best reason to use water as a coolant is because is because it has a high specific heat capacity. However, you can add a mix of antifreeze with your water.
Many pressurized water reactors use "regular" water (light water) as a primay coolant. That means that "only heavy water" is not a rule as regards reactor design. Reactor design specifies the coolant to be used.
If you try and run an auto engine with just water, instead of antifreeze/coolant; your car's engine will not last more than a few minutes, before it overheats or freezes up, depending on the weather conditions and how hard you run the engine. Coolant is not an optional choice instead of water, it's mandatory if you want to keep the engine running in good condition and save your car and a lot of money. Get one of those hoses with meters and red pointer, at Wal-Mart and check and see how well your cars antifreeze/coolant is holding up. It only costs around five dollars.
Tap water from your house