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Can you add water to a radiator?

Updated: 12/13/2022
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12y ago

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Check the owners manual for your car. Older cars run water only, middle aged cars run 50% water and 50% anti freeze and newer cars run 100% anti freeze. Once you know what you car requires just wait until you engine is cold, take off the radiator cap or the the fill cap of the plastic overflow container and add to the full line on the container.

The above answer is totally incorrect, and you should ignore it. The person that posted this does not know what they are talking about. Older cars do not run pure water and newer cars do not run pure anti-freeze. All vehicles require a 50/50 mix of antifreeze and distilled water. In extremely cold climates a 60/40 mix may be necessary. Running pure water or pure anti-freeze are both ansking for trouble. Pure water provides no protection whatsoever. And pure anti-freeze will freeze at a higher temperature than a mix.

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Q: Can you add water to a radiator?
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Look for a radiator cap and add it there.Look for a radiator cap and add it there.


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Can you add antifreeze to your radiator which has been running on water only?

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