Replacement Truck Coolant Level Sensor 1304725 397929 for Scania 2 3 4 Series Trucks & Buses

Product Overview The 1304725 / 397929 / 325528 / 241223 Coolant Level Sensor is a commercial-grade fluid instrumentation safety component engineered as a high-precision direct aftermarket replacement for Scania heavy-duty long-haul trucks, regional distribution tippers, and global mass transit coach fleets. Positioned securely into the lower module or side port of the cooling circuit expansion surge tank, this premium sensor continuously tracks the fluid boundary of the radiator anti-freeze charge. It instantly broadcasts critical fluid depletion thresholds back to the central instrument panel and Engine Control Unit (ECU). Maintaining this electronic security loop is absolutely vital for delivering early low-coolant hazard alerts, enabling fleet operators to prevent rapid under-hood engine boiling, thermal block warping, and catastrophic cylinder liner damage before fluid loss stalls the asset. Technical Specifications Primary Scania OE Reference Numbers: 1304725, 397929, 325528, 241223, 309064 Component Type: Commercial Vehicle Radiator Coolant Expansion Header Tank Water Level Sensor Sender Switch Installation Location: Mounts directly into the designated thread port or receiver seal on the Coolant Expansion Reservoir Tank Assembly Sensing Element Architecture: High-reliability micro-probe mechanism calibrated to mitigate raw signal fluctuations from fluid sloshing, cornering, and hard deceleration Material Engineering: Premium anti-corrosive structural body mated with a heat-stabilized, glass-reinforced polymer connection socket Condition: 100% Brand New Premium Aftermarket Replacement Vehicle, Engine & Generation Platform Compatibility This premium European commercial transport cooling loop monitor features extensive application fitment profiles across multi-generational classic and modern Scania powertrain platforms, heavy chassis networks, and heavy-displacement coach lines: Truck & Bus Generation Series System Application & Operational Fleet Fitment Scania 4 Series Trucks (Models P94, R94, T94, P114, R114, T114, P124, R124, T124, R144, R164 Heavy Fleets) Main expansion surge container level diagnostics and dashboard error tracking matching high-performance 9L, 11L, 12L, and classic V8 heavy turbo diesel engines (DC9, DC11, DSC12, DC16 blocks). Scania 2 & 3 Series Legacy Trucks (Models 82, 92, 112, 142 / 93, 113, 143 Heavy Haulers) Retrocompatible cooling reservoir fluid monitoring and dashboard low-water safety telemetry synchronization for vocational legacy freight carriers and heavy tippers working under severe workloads. Scania Modern Bus & Coach Frameworks (F-Series, K-Series, N-Series Passenger Coaches – e.g., K94, K114, K124 Chassis) Multi-zone engine compartment coolant mass logging and safety alarms matched for urban articulated public transit lines, municipal double-deckers, and luxury intercity touring coaches. Performance Benefits Fix Erratic Gauges & Low-Water Fault Lights: Directly replaces brittle, shorted, or scale-crusted internal sensors that trigger false dashboard “Coolant Level Low” hazard warnings, chime errors, or unwarranted engine torque de-rates when fluid levels are actually sufficient. Advanced Wave Slosh Dampening Calibration: Built with precise signal buffering to block raw telemetry spikes caused by sudden braking, sharp turning, or severe chassis vibration, ensuring clean static and dynamic fluid metrics. Superior Fluid Additive Resilience: Industrial-grade housing design completely resists chemical decay from hot glycol surfactants, anti-freeze rust inhibitors, and under-hood atmospheric scaling. IP67 Rated Waterproof Connection Socket: Reinforced polymer housing features dual internal moisture isolation blocks to secure low-voltage signal paths against engine bay condensation, road mud spray, and high-pressure chemical washdowns. Maintenance Tip: When installing the replacement 1304725 / 397929 coolant level sensor, ensure the vehicle is parked on an absolute level surface, the engine is fully shut down, and the cooling circuit has cooled down entirely to avoid severe scalding hazards from pressurized hot fluid or steam. Carefully release residual pressure by backing off the expansion box cap slowly. If the sensor position sits below the current fluid margin, drain the expansion reservoir fluid partially into a clean container beforehand. Wipe the mounting orifice clear of debris, rust scale, or legacy thread seal tape. Hand-thread the new sensor into the reservoir receiver port first to guarantee perfect alignment, torque firmly to factory specifications using a line wrench strictly on the sensor hex body flats (never apply torque via the plastic terminal plug), refill the cooling loop to the proper cold fill line, check for fluid weeping, and click the original wiring harness clip securely home.