In article <53984cd2$0$29988$c3e8da3$>,
 Steven D'Aprano <> wrote:

> Yes, technically water-cooled engines are cooled by air too. The engine 
> heats a coolant (despite the name, usually not water these days) which 
> then heats the air.

Not water???  I'm not aware of any water-cooled engines which use 
anything other than water.  Well, OK, it's really a solution of ethylene 
or propylene glycol in water, but the water is what does most of the 
heat transfer.  The glycol is just there to provide freezing point 
depression and boiling point elevation.

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