For this reason, automotive technicians often advise operators to turn on the heater and set it to high if the engine is overheating, to assist the main radiator. Like the radiator, the heater core acts by removing heat from the engine. This small radiator, and the associated blower fan, is called the heater core, and serves to warm the cabin interior. All automobiles for many years have used centrifugal pumps to circulate the engine coolant because natural circulation has very low flow rates.Ī system of valves or baffles, or both, is usually incorporated to simultaneously operate a small radiator inside the vehicle. This effect is sufficient for low-power stationary engines, but inadequate for all but the earliest automobiles. As the radiator cools the fluid, the coolant becomes denser and falls. Coolant is heated in the engine, becomes less dense, and so rises. Radiators first used downward vertical flow, driven solely by a thermosyphon effect. Thermosyphon cooling system of 1937, without circulating pump This construction is more prone to failure and less easily repaired than traditional materials.
Modern radiators have aluminum cores, and often save money and weight by using plastic headers with gaskets. For many years radiators were made from brass or copper cores soldered to brass headers. This core is usually made of stacked layers of metal sheet, pressed to form channels and soldered or brazed together. For long vehicles, such as buses, side airflow is most common for engine and transmission cooling and top airflow most common for air conditioner cooling.Īutomobile radiators are constructed of a pair of metal or plastic header tanks, linked by a core with many narrow passageways, giving a high surface area relative to volume. Alternatively, the radiator may draw air from the flow over the top of the vehicle or from a side-mounted grill. Where engines are mid- or rear-mounted, it is common to mount the radiator behind a front grill to achieve sufficient airflow, even though this requires long coolant pipes. Radiators are typically mounted in a position where they receive airflow from the forward movement of the vehicle, such as behind a front grill. Radiators are also often used to cool automatic transmission fluids, air conditioner refrigerant, intake air, and sometimes to cool motor oil or power steering fluid. The radiator transfers the heat from the fluid inside to the air outside, thereby cooling the fluid, which in turn cools the engine. Once the coolant absorbs the heat from the engine it continues its flow to the radiator. To combat this affect, coolant is circulated through the engine where it absorbs the heat from the engine. If heat were allowed to increase unchecked in the engine, components would eventually expand to the point where they would cease to rotate. a fan to draw cool air through the radiator.Ī by product of the combustion process is a large amount of heat.a thermostat to control temperature by varying the amount of coolant going to the radiator.a water pump, usually of the centrifugal type, to circulate the coolant through the system.a radiator, consisting of many small tubes equipped with a honeycomb of fins to dissipate heat rapidly, that receives and cools hot liquid from the engine.
COOLANT ENGINE FACTORY SERIES
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