![]() ![]() ![]() As the liquid boiled inside the capsule, the capsule bellows expanded, opening a sheet brass plug valve within the thermostat. These capsules were made in the form of a cylindrical bellows. The first thermostats used a sealed capsule of an organic liquid with a boiling point just below the desired opening temperature. The development of the automatic thermostat in the 1930s solved this problem by ensuring fast engine warm-up. Research in the 1920s showed that cylinder wear was aggravated by condensation of fuel when it contacted a cool cylinder wall which removed the oil film. ![]() Although most vehicles now have a temperature-controlled electric cooling fan, "the unassisted air stream can provide sufficient cooling up to 95% of the time" and so such a fan is not the mechanism for primary control of the internal temperature. Conveniently, both the sensing element of the thermostat and its control valve may be placed at the same location, allowing the use of a simple self-contained non-powered thermostat as the primary device for the precise control of engine temperature. This regulation is now carried out by an internal thermostat. The internal combustion engine cooling thermostat maintains the temperature of the engine near its optimum operating temperature by regulating the flow of coolant to an air cooled radiator. ![]()
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