When it comes to coolant specifically, it also creates steam and gas pressure that needs to go somewhere. This might take you back to your high school chemistry class, but things expand when they get hot. Nowadays, just about everything in the engine stays in there and is recycled in some way, including the very liquid that keeps those cylinders at the appropriate temperature. As environmental restrictions tightened, manufacturers had to develop ways to keep the byproducts of the internal combustion and cooling chemicals inside the car. It was great for the cars, but not so great for the world around us (sorry ozone). No PCV or CCV lines, no catalytic converters, just dribbling coolant and blow-by all across the roadways. Back in the good "ol days (aka the infancy) of liquid cooled engines, just about all of the emissions systems would vent chemicals and harmful vapors to the atmosphere.
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