Technician a says that using 100% coolant is better for freeze protection in an engine than a mixture with water. technician b says a cooling system should not have a mixture of more than 85% antifreeze to 15% water. who is correct?

Technician B is right.

Explanation:

Generally speaking, most engines use a mixture of 50/50 coolant and water.

This is ideal in places where the weather never gets too extreme, and temperatures rarely go below 0 degrees. Using 100% antifreeze or coolant in any engine is not recommended since this doesn't have the same ability as water to transfer heat to or from the engine. Antifreeze is used to lower the freezing point of water, and it is water itself that does the job of keeping engine temperatures safe.

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