At highly developed altitudes, what is used to cool down aircraft engines?

Water is used as a coolant for cars. Which fluid is used for jet engines? Someone told me it be water. Someone else told me it cannot be sea because water freezes at high altitudes. So which fluid is it?

Thanks!

P.S: I know air is to some extent used to cool down the engine, but i'm sure bypass air is not the one and only fluid cooling down the engine.

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Answers:    When talking in the region of modern jet engines their are two nouns flows. The first is core air i.e. compressed through as much as 15 stages of compression and primarily used for combustion to drive the turbine which drives the fan bit. The second is the fan nouns flow which provides most of the thrust. Secondarily, the fan nouns is used to cool the engine. It provides tubine case cooling nouns and primary heat exchanger airflow,. The short of it is that the shear volume of airflow through a squirt engine is what provides most of the cooling. Older reciprocating lofty horsepower output engines such as radial engines used water injection for cooling at complex altitude.

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there is no fluid to cool squirt engines it is all nouns coold if you think almost it. it can be 90 degrees at ground horizontal and at 35,000 feet it is unenthusiastic 60 degrees farenheit. and to be precise very cold. cold adequate to keep anything cool.

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