Abstract: A flush attachment for a coolant hose accommodates gas or air induction to mix with a pressurized stream of cleaning liquid for efficient scavenging of rust or scale from machinery cooling systems. The construction of the attachment also protects against over pressurization and possible bursting.

Abstract: An internal combustion engine cooling system is flushed by:(a) providing a controlled pressurized flow of flushing liquid and entrained gas bubbles,(b) and passing said flow alternately through(i) the radiator in a reverse direction,(ii) the engine coolant passages in a reverse direction,(iii) the radiator in a forward direction,(iv) the engine coolant passages in a forward direction.

Abstract: A coolant container assembly is especially designed for use with an internal combustion engine cooling system together with means to produce a pressurized flow of flushing liquid to flush the system, such means including a source of pressurized gas such as air. The assembly includes:(a) a coolant liquid container operatively connectible to said source of pressurized gas via a pressure regulator,(b) the container having an inlet to pass said gas into the container to pressurize coolant therein,(c) there being a flow restrictor connected in series with said inlet to limit the rate of gas flow into the container thereby to inhibit inadvertent bursting of the container, and(d) the container having an outlet communicable with said cooling system to pass pressurized coolant solution thereto.

Abstract: An internal combustion engine cooling system is flushed by:A. providing a controlled pressurized flow of flushing liquid and entrained gas bubbles,B. and passing said flow alternately throughI. the radiator in a reverse direction,Ii. the engine coolant passages in a reverse direction,Iii. the radiator in a forward direction,Iv. the engine coolant passages in a forward direction.Flow distribution control valves have ports directly connected so that the valve selectors may have corresponding clock angle positions; also, short length plastic tubing may be used to connect the valve ports, and to connect to console ports.