A technician is analyzing the complete circulation cycle of an automotive liquid cooling system operating at normal engine running temperature. Arrange the stages of the coolant circulation loop in the correct chronological order, starting from the moment coolant is discharged under pressure from the water pump.
- 1Coolant enters the lower engine block water jackets and absorbs combustion heat from the cylinder walls.
- 2Coolant moves upward through passages into the cylinder head to absorb extreme heat around the combustion chambers and exhaust ports.
- 3Hot coolant flows past the open thermostat and enters the upper radiator hose.
- 4Coolant passes through the narrow tubes of the radiator core, shedding thermal energy to passing ambient air.
- 5Cooled fluid exits the lower radiator outlet and is drawn through the lower radiator hose back into the suction side of the water pump.
Cevap
The correct sequence begins with coolant entering the engine block water jackets, ascending into the cylinder head, passing through the open thermostat into the upper radiator hose, traveling through the radiator core tubes to reject heat, and finally returning via the lower radiator hose to the water pump inlet.
In a standard automotive liquid cooling system, the centrifugal water pump forces coolant into the cylinder block water jackets first. From the block, coolant rises into the cylinder head passages where it absorbs intense heat from combustion chambers and exhaust ports. Once operating temperature is attained, the thermostat opens, directing the hot coolant through the upper radiator hose and into the radiator core. Ambient airflow passing across the radiator cooling fins removes heat from the liquid. Finally, the cooled liquid collects at the radiator outlet tank and is pulled through the lower radiator hose back into the water pump inlet to repeat the cycle.
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Anahtar Kavram
Coolant circulation flow path and thermal regulation in an automotive closed-loop cooling system
Tahmini Süre:1m 30s