Basically, vehicles include many different and complicated parts and systems; these are constructed and installed to make the vehicle function as expected, and function well. Among such vehicle systems, engines and its cooling systems are the most important when it comes to performance. The vehicle's cooling system includes parts such as radiator and water pump. It works in way where the water in the system circulates through passages around the cylinders and then travels through the radiator to cool it off. In some vehicles though, the engine is air-cooled instead and this makes the engine lighter but hotter; this process decreases the engine life and performance. So mostly radiator is popularly used; defined as a heat exchanger that is used to cool an engine once it has reached operating temperature. Radiator along with the rest of the cooling system's parts use water mixed with antifreeze or coolant; the cool air that passes through the vehicle's grille cools that water which then returns to the engine through a hose.
Vehicles, your Isuzu included, have fan that switches on when there's not sufficient air passing through the radiator to cool the water while some vehicles with automatic transmission also send transmission fluid to the radiator so it can be cooled. Since radiator is important in your vehicle's performance, you should at all times make sure that they are functioning and are damage-free. And if you need to replace your Isuzu's radiator, the market offers lots of replacement radiator that includes pieces that fit Isuzu vehicles should you need one. OEM radiator, aftermarket radiator, factory original radiator or even used Isuzu radiator are available in most parts and automotive dealers.