Product Description
The Bendix 109578 AD-9 Air Dryer Heater and Thermostat Replacement Kit is designed to maintain proper air dryer operation during cold weather. This 12-volt, 75-watt assembly helps prevent moisture from freezing inside the air dryer, reducing the risk of ice buildup that can interfere with air brake system performance.
The thermostatically controlled heater automatically provides heat when temperatures drop, helping maintain proper purge valve operation and dependable compressed air system performance. Designed for compatible Bendix AD-9 and AD-9si air dryers, this replacement kit includes components needed to service the original heater and thermostat assembly.
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Genuine Bendix replacement heater and thermostat kit
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Designed for compatible Bendix AD-9 and AD-9si air dryers
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12-volt electrical system
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75-watt heating element
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Thermostatically controlled operation
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White electrical connector
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Helps prevent cold-weather freeze-ups
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Supports dependable air dryer and purge valve operation
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Includes replacement seals and installation components
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Suitable for heavy-duty commercial truck air brake systems
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Part Number: 109578
Kit contents include the heater and thermostat assembly, O-rings, sealing ring, screws, lubricant, and dielectric grease.
Before ordering, verify the existing heater voltage, connector color, and air dryer model. The 109578 is a 12V heater kit and should not be substituted for a 24V assembly.
