![]() The closed-type system doesn’t vent excess coolant to the outside when the heat causes expansion of the coolant. Deciding which one to use requires the answers to a number of questions about your cooling system.įirst you must determine which type of cooling system that you have.Ĭlosed-type cooling system. It is offered in two different models designed to engage at either 185☏. We chose to use the fan control kit from Spal to control our Spal 16-inch fan on our Cool Craft custom shroud installation. Electric fans don’t use a mechanical means of disengagement though, they are just turned on or off with either a temperature sensing switch installed in the coolant flow or by a toggle switch controlled by the vehicle operator.Ĭomponents to accomplish this can be bought at the local parts store but the job is made easier when one of the many fan control kits is utilized. The most popular solution for this was to install an electric fan and thin-line shroud in place of the mechanical unit.Įlectric fans should only operate when the airflow is not sufficient in the same way as mechanical fans do when they are equipped with a fan clutch. The installation of big engines in small engine bays created a problem though room for the traditional fan/shroud combo was limited. To remove this power drain a fan clutch was added to disengage the fan so that it freewheeled at highway speeds when the airflow was sufficient. If it did, the engine would most likely never reach proper operating temperature and the parasitic loss of power could significantly lower operating efficiency. However, it is not necessary for the fan to operate at times when the vehicle is running at highway speeds. The addition of a shroud helped to funnel the airflow through the full face of the core thereby increasing the cooling effect. ![]() It drew air through the radiator when the forward motion of the vehicle was too slow to create enough airflow through the radiator. For many years the most effective means of cooling the engine at slow speeds and when idling was with a multi-blade fan attached to the front of the water pump pulley. ![]()
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