PAI 050673 Coolant Level Sensor Replaces Cummins 4903489

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The PAI 050673 is a 4-pin coolant level sensor that replaces Cummins 4903489 (and the superseded 3612521 / 4383932) on Cummins L10, M11, ISM, and N14 engines. It threads into the u pper coolant tank or recovery bottle and signals low coolant to the ECM so the engine can warn or derate before head temperatures climb. Signs You Need a New Coolant Level Sensor Low coolant warning that won't clear with a full system Intermittent coolant alarm that comes and goes with vibration Coolant fault codes with verified normal coolant level Visible cracking, corrosion, or seepage at the sensor body Specifications Manufacturer PAI Industries Part Number 050673 Part Type Coolant Level Sensor Pin Count 4 Connector Shape Oval Thread Size 1/4 in - 18 NPT Overall Length 3.93 in Engine Compatibility Cummins L10, M11, ISM, N14 Cross References This sensor replaces or is equivalent to the following part numbers: Cummins: 4903489, 3612521, 4383932 Mack (PAI alias): 4333-1673785C92, 1MR4299 Navistar (PAI alias): 1673785, 1673785C91, 1673785C92 Peterbilt (PAI alias): 86714A1 Applications This coolant level sensor fits the following engines: Cummins L10 Cummins M11 Cummins ISM Cummins N14 (Celect / Celect Plus) Verify sensor location, port thread, and connector pinout on your engine before ordering to confirm fitment. Show more