The inner section of the Honda radiator core is filled with small conduits that the coolant will flow through when it enters this critical part of your vehicle's cooling system. The reason for this design is so the maximum amount of surface area can come in direct contact with the hot coolant and dissipate as much heat as possible. Helping the radiator core dissipate the heat are hundreds of small fins on the exterior of the core channels. These are the most visible components of the core, and take the heat from the channels and transfers it to the surrounding atmosphere. This makes it possible for the engine temperature on your Honda to remain at a constant level. Over the life time of your vehicle, the Honda radiator core will have to be flushed out. This is recommended to be done on an annual basis. This flushing removes the sediment that has become trapped and bonded to the channels in the radiator core from the dissolved solids that are present on your coolant. This is required to keep the channels as open as possible since the sediments reduce the size of the channels and reduce the radiator core's ability to efficiently dissipate the heat. A Honda owner can perform this coolant flush by disconnecting the top radiator hose and staring their engine. A water hose is then placed in the inlet of the radiator and water allowed to flow. As the engine heats up the thermostat will open dispensing the coolant from the engine which is allowed to spill out onto the pavement. Once all of the coolant has been removed, the engine is turned off and the bottom coolant hose is disconnected. This will drain the entire coolant system including the radiator core of any sediment and coolant. With the hoses reconnected and the new coolant added, the Honda is again ready for the road.