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An alcohol based fluid that is miscible in water and used to remove heat from the engine. Also see the [cooling-system] tag for related components such as the radiator and water-pump.

0 votes

Can I add 50/50 to plain water

The cost of a gallon of coolant and an hour's labor are well worth it. In addition to preventing freezing, coolant also prevents boiling which causes air bubbles and overheating. … Coolant also contains additives to prevent corrosion (rust). …
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7 votes

What happens if I drive without antifreeze in my car?

We also add "antifreeze" (also called "coolant") which apart from freeze prevention also increases the boiling point. …
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  • 974
1 vote

Does a small amount of dried coolant warrant replacing block heater, radiator and hose Or ca...

"...replace my radiator, block heater, and hose urgently..." My, this mechanic must have X-Ray vision. He can see all these bad parts without a test, from some dried residue (not wet, even after you …
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  • 974
1 vote

Air trapped inside radiator after adding coolant

The low level of coolant won't cause engine surging, nor will air in the system. It is good to try to get it out though. …
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  • 974
20 votes

Is Prestone "All Makes/All Models" coolant *really* compatible with all models?

So to support its claim Prestone merely specifies that its coolant be used in North America! Simple. … Prestone® Antifreeze/Coolant is completely safe for use in both foreign and domestic vehicles." …
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