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bodgit and leggit garage how to put a new radiator in a 1997 toyota avensis

3,912 views · Published 10 October 2014 · 11:59 · Indexed 4 October 2026

Channel: bodgit and leggit garage · 2014 · People & Blogs

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 how to put a new radiator in a 1997 toyota avensis

For other uses, see Radiator (disambiguation).
Radiators are heat exchangers used for cooling internal combustion engines, mainly in automobiles but also in piston-engined aircraft, railway locomotives, motorcycles, stationary generating plant or any similar use of such an engine.

Internal combustion engines are often cooled by circulating a liquid called engine coolant through the engine block, where it is heated, then through a radiator where it loses heat to the atmosphere, and then returned to the engine. Engine coolant is usually water-based, but may also be oil. It is common to employ a water pump to force the engine coolant to circulate, and also for an axial fan to force air through the radiator.

Contents  [hide] 
1 Automobiles and motorcycles
1.1 Radiator construction
1.2 Coolant pump
1.3 Heater
1.4 Temperature control
1.4.1 Waterflow control
1.4.2 Airflow control
1.5 Coolant pressure
1.6 Engine coolant
1.7 Boiling or overheating
1.8 History
1.9 Supplementary radiators
2 Aircraft
2.1 Surface radiators
2.2 Pressurized cooling systems
2.3 Evaporative cooling
2.4 Radiator thrust
3 Stationary plant
4 See also
5 References
5.1 Sources
6 External links
Automobiles and motorcycles[edit]

Coolant being poured into the radiator of an automobile
In automobiles and motorcycles with a liquid-cooled internal combustion engine, a radiator is connected to channels running through the engine and cylinder head, through which a liquid (coolant) is pumped. This liquid may be water (in climates where water is unlikely to freeze), but is more commonly a mixture of water and antifreeze in proportions appropriate to the climate. Antifreeze itself is usually ethylene glycol or propylene glycol (with a small amount of corrosion inhibitor).

The radiator transfers the heat from the fluid inside to the air outside, thereby cooling the fluid, which in turn cools the engine. 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. Radiators are typically mounted in a position where they receive airflow from the forward movement of the vehicle, such as behind a front 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. Alternatively, the radiator may draw air from the flow over the top of the vehicle or from a side-mounted grill. 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.

Radiator construction[edit]
Automobile radiators are constructed of a pair of header tanks, linked by a core with many narrow passageways, giving a high surface area relative to volume. This core is usually made of stacked layers of metal sheet, pressed to form channels and soldered or brazed together. For many years radiators were made from brass or copper cores soldered to brass headers. Modern radiators save money and weight by using plastic headers and may use aluminium cores. This construction is less easily repaired than traditional materials.


Honeycomb radiator tubes
An earlier construction method was the honeycomb radiator. Round tubes were swaged into hexagons at their ends, then stacked together and soldered. As they only touched at their ends, this formed what became in effect a solid water tank with many air tubes through it.[1]

Some vintage cars use radiator cores made from coiled tube, a less efficient but simpler construction.

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