Product Features

This sensor adopts brass main body with float‑type sensing structure. It is equipped with integrated black PVC wiring harness and waterproof 2‑pin connector. Designed for complex working conditions of bus engine compartment, it can resist vibration, water splash and corrosion. It supports 12‑24V wide‑voltage working range, adapts to most bus electrical systems. Compact structure with standard brass external thread, convenient for direct replacement of original parts.

Product Advantages

1. Float‑type induction brings high response sensitivity, quick trigger for low‑liquid‑level alarm.

2. Excellent waterproof and vibration‑resistant performance, suitable for long‑term operation in harsh engine cabin environment.

3. Stable signal output, low false‑alarm rate, reliable monitoring performance.

4. Plug‑and‑play design, no complicated modification required during installation.

5. Strictly tested according to commercial‑vehicle spare‑part standards, long service life and low failure rate.

6. Directly compatible with mainstream bus models, easy for after‑sales maintenance and spare‑parts supply.

Installation Steps

1. Confirm that the engine has been fully cooled. Release residual pressure inside the expansion tank before starting installation.

2. Unscrew the old sensor from the threaded hole of the expansion tank.

3. Screw the new 3825‑00009PT sensor clockwise into the threaded hole, tighten moderately. Do not apply excessive torque to prevent brass thread cracking.

4. Align and insert the waterproof 2‑pin connector into the corresponding vehicle wiring plug.

5. Add coolant to the specified normal liquid level.

6. Switch on the bus power supply and test whether the low‑water‑level alarm function works normally.

Notes

1. Installation and disassembly must be completed under cold‑engine condition. Hot coolant will cause scald hazard. Never operate when the engine is hot.

2. Do not over‑tighten the sensor thread; excessive force will damage the brass thread.

3. Keep wiring harness and connector far away from high‑temperature exhaust components, avoid cable aging and melting.

4. Regularly check the threaded joint for water seepage. Replace the sensor immediately if leakage occurs.

5. Use qualified coolant. Impurities and sediments attaching to the float will cause signal deviation or false alarm.

6. Do not pull or drag the wiring harness forcibly during installation and maintenance.

7. Do not modify or cut the original harness arbitrarily, otherwise the alarm function may fail.