Abstract: A coolant circuit for an internal combustion engine having a cylinder crankcase with at least two opposing cylinder banks, and cylinder heads associated to the cylinder banks, includes a first subcircuit for cooling the cylinder crankcase and a second subcircuit in separate parallel relationship to the first subcircuit for cooling the cylinder heads. A coolant pump circulates a coolant at least temporarily between a main heat exchanger and the cylinder heads and/or cylinder crankcase. At least one check valve is arranged in the first subcircuit to allow a flow of coolant through the cylinder banks only in a direction from an intake side to an exhaust side.

Abstract: A valve arrangement for venting a coolant circuit of an internal combustion engine having several subcircuits includes a valve which is in fluid communication with a primary vent line extending from one of the subcircuits. At least one secondary vent line is in fluid communication with the valve and extends from another one of the subcircuits. The primary and secondary vent lines are connectable to a shared third vent line which feeds into a compensating reservoir arranged at a geodetically highest point in the coolant circuit. The valve is constructed to establish a continuous fluid communication of the primary vent line with the compensating reservoir via the third vent line and to establish a fluid communication of the secondary vent line with the compensating reservoir via the third vent line only in the presence of air bubbles in the secondary vent line.

Abstract: A valve arrangement for venting a coolant circuit of an internal combustion engine having several subcircuits includes a valve which is in fluid communication with a primary vent line extending from one of the subcircuits. At least one secondary vent line is in fluid communication with the valve and extends from another one of the subcircuits. The primary and secondary vent lines are connectable to a shared third vent line which feeds into a compensating reservoir arranged at a geodetically highest point in the coolant circuit. The valve is constructed to establish a continuous fluid communication of the primary vent line with the compensating reservoir via the third vent line and to establish a fluid communication of the secondary vent line with the compensating reservoir via the third vent line only in the presence of air bubbles in the secondary vent line.

Abstract: A coolant circuit for an internal combustion engine having a cylinder crankcase with at least two opposing cylinder banks, and cylinder heads associated to the cylinder banks, includes a first subcircuit for cooling the cylinder crankcase and a second subcircuit in separate parallel relationship to the first subcircuit for cooling the cylinder heads. A coolant pump circulates a coolant at least temporarily between a main heat exchanger and the cylinder heads and/or cylinder crankcase. At least one check valve is arranged in the first subcircuit to allow a flow of coolant through the cylinder banks only in a direction from an intake side to an exhaust side.