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Coolant seepage at the sensor body or surge-tank port
Engine derate or cold-start drivability issues tied to a temperature signal fault
Baldwin: BF1272-SP
SKF / Chicago Rawhide: 42626
PAI 450551 Low Air Pressure Switch – Replaces Navistar 1658820C1 Automatic Coolant seepage at the sensorLow air pressure switch for International and other heavy duty truck air brake systems. PAI 450551 activates between 65 and 75 PSI to trigger the dash low air warning buzzer. Single terminal 12 V design with 1 8" 27 NPT mounting thread and pre applied locking compound; replaces Navistar 1658820C1, Freightliner FSC17452336, and Mack 4333 1658820C1. Signs You Need a New Low Air Pressure Switch Low air warning buzzer activates randomly at normal
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