Arrangement of boiling liquid cooling system of internal combustion engine

In a motor vehicle having an internal combustion engine mounted in an engine room thereof, a boiling liquid cooling system for cooling the engine by using a latent heat of coolant, comprising:

• means defining in the engine proper a coolant jacket into which the coolant is introduced in liquid state and from which the coolant is discharged in gaseous state, said coolant jacket containing therefore liquid state coolant therein under operation of the engine leaving an unoccupied space at the upper portion thereof thereby to form a coolant level therein;
• a rigid conduit member securedly mounted on the engine proper and extending upwardly from said unoccupied space of the coolant jacket;
• a condenser having an inlet connected to the leading end of said rigid conduit member and an outlet positioned lower than said inlet, said condenser being mounted over the engine proper;
• a conduit member extending downwardly from said outlet of the condenser to said coolant jacket at a position lower than said coolant level;
• a pump mounted to said conduit member for pumping the liquefied coolant from the condenser into said coolant jacket below the coolant level;
• and
• a rigid bracket member extending from the engine proper to support thereon said condenser.