True, but there is more to it...
No, at least, not always.
Not true with all liquids.
Different liquids, depending on their properties, will react differently to pressure. Sodas and beers will remain unfrozen while under pressure, but once the pressure is taken away, it could present an "instant" freeze effect. Engine coolant, on the other hand, is designed to have an increased boiling point while under pressure. The coolant system as a whole operates under pressure, and the pressure increases the boiling point so it wont present bubbles in the system. Take the pressure away, the coolant will boil nearly instantly.