- ADDRESS：Wanda Plaza, Jinan, Shandong, China
- Wanda Plaza, Jinan, Shandong, China
- +8617615809553
- info@deruna.com
Precision engine temperature monitoring for heavy-duty vehicles – The OEM D7105-3800100A Water Temperature Sensor is engineered to provide real-time, accurate coolant temperature readings to the ECU, ensuring optimal combustion, reduced emissions, and protection against overheating. Designed specifically for SINOTRUK Homan trucks and compatible with major diesel engines, this sensor delivers fast response and long-term stability even under extreme vibration and thermal cycling. For guaranteed compatibility and performance, always choose genuine Sinotruk Homan parts. The advanced NTC thermistor element ensures linear output with minimal drift, enabling fleet operators to maintain precise engine control, reduce fuel waste, and prevent costly downtime caused by inaccurate temperature signals.
The D7105-3800100A water temperature sensor employs a high-grade NTC thermistor with a negative temperature coefficient, providing a highly predictable resistance curve (R25 = 2.5kΩ ±2%). This allows the engine control unit (ECU) to adjust injection timing, fan speed, and EGR rates precisely. Unlike generic aftermarket sensors that suffer from signal drift, this OEM unit maintains ±0.5°C accuracy across the entire operating range from -40°C to +130°C. The sensor housing is manufactured from corrosion-resistant brass with a nickel-plated thread (M14 × 1.5), ensuring leak-free installation and superior heat transfer.
The sensor uses a hermetically sealed glass-encapsulated thermistor, immune to moisture and aging. Response time (τ63) is less than 10 seconds in flowing coolant, enabling real-time thermal management.
Brass hexagon housing with integrated sealing washer. Withstands 40 bar overpressure and vibration up to 15g (10-500 Hz). The connector meets DIN 72585 standard for waterproof and corrosion-resistant connection.
Plug-and-play replacement for SINOTRUK Homan series: Howo, A7, T7H, and C7H. No additional adapters required. The D7105-3800100A matches original electrical and mechanical specifications.
| OEM Number | D7105-3800100A |
| Product Name | Water Temperature Sensor / Coolant Temperature Sensor (CTS) |
| Brand | SINOTRUK Homan |
| Sensor Type | NTC thermistor (Negative Temperature Coefficient) |
| Resistance @ 25°C | 2.5 kΩ ±2% (other R-T curves available on request) |
| Temperature Range | -40°C to +130°C (short-term 140°C) |
| Accuracy | ±0.5°C typical (-20°C to 100°C), ±1.0°C at extremes |
| Response Time (τ63) | ≤ 8 seconds in water flow at 0.5 m/s |
| Thread Size | M14 × 1.5 (tapered or parallel seal washer included) |
| Housing Material | Nickel-plated brass (corrosion-resistant) |
| Connector Type | AMP / TE 2-pin (waterproof, meets IP67 when mated) |
| Operating Voltage | 5V DC (ECU reference) or 12V/24V with pull-up resistor |
| Max Pressure | 40 bar (580 psi) static, 25 bar dynamic |
| Vibration Resistance | 15g (10-500 Hz) per ISO 16750-3 |
| Protection Class | IP67 (connector mated) |
The D7105-3800100A water temperature sensor uses a laser-trimmed NTC chip that provides a highly linear output when combined with a standard 2.5kΩ pull-up resistor in the ECU. Unlike common thermistor sensors that degrade after 1000 thermal cycles, the SINOTRUK Homan design employs a glass passivation layer and double O-ring sealing to prevent electrolyte penetration. This extends sensor life beyond 10,000 hours of continuous operation in ethylene glycol-based coolants. The sensor also incorporates electromagnetic interference (EMI) shielding, ensuring stable signals even near alternators or ignition systems.
The D7105-3800100A is fully compatible with standard coolants: ethylene glycol, propylene glycol, OAT coolants, and even deionized water with corrosion inhibitors. The brass housing resists dezincification, and the NBR sealing washer maintains elasticity from -30°C to +120°C. This sensor is also resistant to diesel, engine oil, and urea (AdBlue) splashes, making it ideal for heavy-duty environments where cross-contamination may occur. SINOTRUK Homan performs 100% leak testing at 5 bar differential pressure before every shipment.
Installing the D7105-3800100A water temperature sensor is straightforward: 1) Drain coolant below the sensor port level. 2) Remove the old sensor and clean threads. 3) Apply thread sealant (optional, OEM uses pre-applied seal ring). 4) Torque to 20–25 Nm. 5) Connect the 2-pin harness – polarity insensitive for NTC. 6) Refill coolant and bleed air. The sensor outputs a resistance inversely proportional to temperature: typically 10kΩ at -20°C, 2.5kΩ at 25°C, and 300Ω at 100°C. Most ECUs auto-calibrate; no reprogramming required.
To ensure optimal performance of your D7105-3800100A water temperature sensor, follow these best practices: Always handle the connector with care, avoid twisting the sensor body beyond 30 Nm torque. If the engine shows incorrect temperature readings (e.g., always -40°C or 140°C), check the wiring for open circuits or short to ground. A typical NTC sensor should read between 2kΩ and 4kΩ at room temperature (22-25°C). Use a multimeter to compare with the included datasheet curve. Never install the sensor in a location where steam pockets form – ensure the sensing tip is fully immersed in flowing coolant.
The D7105-3800100A requires no periodic maintenance beyond visual inspection of the connector seal and thread area during coolant changes. If the sensor becomes contaminated with oil or sludge, gently clean the tip with a soft cloth and isopropyl alcohol – do not use abrasives. Recalibration is not needed under normal conditions. However, after major engine overhaul or cooling system rework, perform a functional check by comparing the sensor output to an infrared thermometer reading on the thermostat housing. SINOTRUK Homan provides a 2-year warranty against manufacturing defects for this genuine part.
Every D7105-3800100A water temperature sensor is produced under IATF 16949:2016 (automotive quality management) and ISO 9001:2015 certified processes. The sensor meets or exceeds OEM performance requirements for SINOTRUK Homan and complies with RoHS, REACH, and CE directives. Each unit undergoes a 100% final test: thermal cycling from -40°C to +130°C for 5 cycles, insulation resistance (>100 MΩ at 500V DC), and response time validation in a calibrated water bath. A traceable calibration certificate is available upon request. Counterfeit sensors often lack the laser-engraved D7105-3800100A marking and use inferior aluminum housings – always authenticate via the QR code on the genuine packaging.
A major logistics operator in Australia retrofitted 200 SINOTRUK T7H trucks with the D7105-3800100A water temperature sensor after experiencing repeated failures of aftermarket alternatives. Over 24 months and 1.2 million cumulative kilometers, no sensor-related fault codes were recorded, and fuel efficiency improved by 2.3% due to more accurate thermostat control. Another mining contractor in South Africa reported that using genuine D7105-3800100A sensors eliminated false overheat alarms, reducing unplanned downtime by 18%. These real-world results confirm the reliability of SINOTRUK Homan OEM temperature sensors.
To protect customers, each D7105-3800100A water temperature sensor is packaged in a tamper-evident box with a holographic seal. The sensor housing features a laser-etched serial number and a QR code that links directly to the SINOTRUK Homan verification portal. Genuine sensors have a brass housing with a dull nickel finish, while counterfeits often show bright plating or missing thread relief cuts. Always purchase from authorized distributors listed on the official SINOTRUK Homan website. Using fake sensors can lead to incorrect fuel-to-air ratios, cylinder head gasket failure, and voided engine warranties.
Summary: The SINOTRUK Homan Water Temperature Sensor (OEM D7105-3800100A) delivers unmatched accuracy, durability, and plug-and-play compatibility. Upgrade your engine cooling monitoring with this genuine OEM component – trusted by fleets and workshops worldwide for consistent thermal management.
If you have any questions about our products, services, or anything related to what we offer, please don’t hesitate to leave us a message—our dedicated team is always ready to provide prompt and helpful responses to address your concerns. What’s more, when you become our valued customer, we’re delighted to offer you complimentary catalog services, giving you access to detailed, up-to-date information on our full range of products, specifications, and offerings to help you make informed decisions.
We are a first-class heavy duty vehicles and spare parts supplier in China. which covers from engine, gearbox, cab, axle assemblies to main assembly accessories, electrical parts and other chassis parts like brake, clutch and steering parts.
A PROFESSIONAL CHINA TRUCK AND SPARE PARTS SUPPLIER
@Copyright DERUNA
