What is the purpose of the alcohol evaporator found on some older air brake systems?

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1. It removes oil from the fuel before it reaches the engine, a function that has nothing to do with the air system or its valves
2. It cools the compressor down after long descents
3. It cleans the windshield using leftover system air
4. It adds a small amount of alcohol to the air system to help reduce the chance of ice forming in the lines and valves during cold weather

Correct!

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