Engine Coolant Expansion Tank Water Level Sensor Replacement for Mercedes-Benz Actros Axor Atego Setra Buses | OEM A0035401717 A0025404417

Product Overview The A0035401717 / A0025404417 Radiator Coolant Water Level Sensor is a vital engine protection component engineered as a premium aftermarket replacement for Mercedes-Benz commercial heavy trucks, vocational chassis, and luxury coaches. Mounted directly into the antifreeze/coolant expansion tank reservoir, this sensor continuously monitors the fluid volume. If the coolant level drops below safety thresholds, it instantly triggers the dashboard warning indicator to prevent catastrophic engine overheating, cylinder head warping, or cracked blocks. Built with anti-corrosive probe terminals, it ensures stable signaling despite continuous exposure to pressurized glycol mixtures. Technical Specifications Primary Mercedes-Benz OE Reference Codes: A0035401717, 0035401717, A0025404417, 0025404417 Cross-Reference Interchange Codes: A0015405317, 0015405317, A6345400017, 6345400017 Component Type: Coolant Expansion Tank Fluid Level Indicator Switch / Probe Assembly Material Properties: Thermal-stabilized polymer housing with chemical-resistant seal rings Condition: Brand New Premium Aftermarket Replacement Vehicle & Fleet Compatibility This coolant level sensor is manufactured to match factory electrical terminal curves and thread specifications, providing universal fitment across major European heavy transport and passenger platforms: Vehicle Model & Fleet Range Engine & System Integration Mercedes-Benz Actros Series (MP1, MP2, MP3 generation fleets) Fits standard long-haul configurations (e.g., 1840, 1844, 2641, 3341) utilizing pressurized overhead surge reservoirs. Mercedes-Benz Axor & Atego Series (Axor 2 / Atego 2) Widespread fitment for regional cargo distribution and construction tippers requiring reliable cooling circuit monitors. Mercedes-Benz Econic Low-Entry Trucks Fits specialized municipal refuse collection units and low-cab urban distribution setups. Setra Coach Buses (S300 & S400 Series) Compatible with intercity transit and luxury touring coaches (e.g., S315, S415, S416) carrying matching V6/V8 auxiliary engine cooling loops. Performance Benefits False Alert Mitigation: Advanced internal circuitry filters out intermittent fluid sloshing waves during mountain climbing or abrupt braking cycles. Excellent Chemical Shielding: Engineered from high-density, glass-reinforced polyamide to withstand boiling anti-freeze compounds, additive scales, and aggressive oil residues. Leak-Free Seal Geometry: Features a factory-calibrated rubber shoulder seal ring that easily isolates high expansion pressures inside the header tanks. Maintenance Tip: In heavy transport routines, a false “Low Coolant Level” warning icon alongside a completely full plastic expansion reservoir is a classic symptom of a fouled sensor probe. Over years of fleet service, hard water scaling or runtime rust sediments coat the sensor tips, causing electrical open circuits. When swapping out your old A0035401717 sensor, allow the engine block to cool down completely to release system counter-pressure. Clean out the water tank mount opening before screwing in the new aftermarket unit to avoid tearing the threaded seal ring.