Dongfeng GX Water level sensor assembly 3690010-H0100

As a critical safety component for the Dongfeng GX’s engine, the 3690010-H0100 assembly provides continuous, high-precision monitoring of the cooling system’s water/antifreeze level. It uses a float-type or electrode-type sensing mechanism (depending on Dongfeng GX’s design) to detect fluid levels in real time: when the water level drops below the safe threshold (e.g., 20% of the expansion tank capacity), the sensor sends a signal to the vehicle’s ECU. This triggers two key responses: an alert on the instrument cluster (e.g., a "Low Coolant" warning light) and, in some cases, integration with the OBD system to log a diagnostic trouble code (DTC). By preventing engine overheating due to insufficient coolant, the sensor directly protects the engine from severe damage—such as cylinder head warping or piston seizure

The 3690010-H0100 sensor assembly features a corrosion-resistant, high-temperature-resistant design to withstand the harsh conditions of the engine cooling system. The main housing is made of chemical-resistant engineering plastic (e.g., PPS or PA66+GF30), which resists degradation from long-term exposure to antifreeze, coolant additives, and high temperatures (operating range: -40°C to 120°C). The sensing element (float or electrode) is constructed from stainless steel 304 or brass (with anti-corrosion plating), preventing rust or scaling that could impair sensitivity. Additionally, the sensor’s sealing ring uses nitrile rubber (NBR) or fluororubber (FKM)—materials that maintain elasticity and sealing performance even after years of contact with coolant, eliminating the risk of fluid leakage into the sensor’s electrical components

The 3690010-H0100 is engineered with Dongfeng GX-specific technical parameters to ensure reliable performance and system integration. Its sensing range is calibrated to match the Dongfeng GX cooling system’s fluid capacity (e.g., detecting levels from "Empty" to "Full" in a 5L expansion tank) with an accuracy of ±5%—ensuring no false alarms or missed low-level conditions. The electrical system operates on the Dongfeng GX’s standard 12V or 24V on-board voltage, with a low power consumption design (≤3W) to avoid draining the battery. The output signal is tailored to the vehicle’s ECU: it typically uses a digital switch signal (on/off for threshold detection) or an analog voltage signal (0-5V for continuous level monitoring), ensuring compatibility with the Dongfeng GX’s instrument cluster and OBD system. The electrical connector is also OE-matched, featuring a waterproof rating of IP67 to protect against moisture intrusion from engine bay splashes

The 3690010-H0100 water level sensor assembly adheres to strict automotive quality standards and undergoes comprehensive testing to ensure durability and reliability. It is manufactured in accordance with ISO/TS 16949, the global quality management standard for automotive components, with each unit subject to 100% factory inspection: including coolant compatibility testing (exposure to antifreeze for 1,000+ hours), temperature cycle testing (from -40°C to 120°C), and electrical performance testing (signal accuracy under varying voltages). The sensor also complies with Chinese automotive standards (GB/T 19001) and meets Dongfeng’s internal quality requirements for cooling system components. To support customers, it comes with a manufacturer’s warranty (typically 12 months or 20,000 kilometers) and access to technical support—including installation guidelines and troubleshooting assistance—making it a trusted choice for Dongfeng GX owners and repair facilities