Engine Heat Transfer: The engine produces heat during combustion, which needs to be dissipated to prevent overheating. The thermostat plays a crucial role in regulating the coolant flow.
Hot Coolant Circulation: When the engine reaches its optimal operating temperature, the thermostat opens, allowing the hot coolant to flow from the engine into the upper radiator hose. The hot coolant then enters the radiator.
Radiator Function: The radiator is designed to release the heat from the hot coolant. As the hot coolant passes through the radiator's internal tubes and fins, air from outside the vehicle flows through the radiator's core. This airflow extracts the heat from the coolant, causing it to cool down.
Coolant Return: Once the coolant has cooled down, it flows through the bottom radiator hose and returns to the engine block. The now-cooled coolant absorbs the engine heat again and re-enters the top radiator hose, repeating the cooling cycle.
Overall, the flow of hot coolant through the top radiator hose and the cold coolant's return through the bottom hose are part of the normal operation of the vehicle's cooling system. If either hose is excessively hot or cold, it could indicate an underlying issue with the thermostat or other components of the cooling system. In such cases, it's advisable to consult a qualified mechanic for further diagnosis and repairs.
