What Causes the False High Reading on the Wuling Zhiguang Water Temperature Gauge?
2 Answers
The false high reading on the Wuling Zhiguang water temperature gauge is caused by oxidation or even detachment of the grounding wire, leading to poor contact. Here are the specific details: 1. Water Temperature Sensor: The water temperature sensor is a resistive-type sensor that relies on grounding through its casing to form a test circuit. When the grounding is poor, it presents a high-resistance state, resulting in incorrect water temperature signals and triggering a high-temperature alarm. 2. Grounding Wire Oxidation: Oxidation of the grounding wire can cause many hard-to-detect faults, such as false high readings on the water temperature gauge, or oxidation and acid corrosion on the battery terminals, leading to difficulties in starting. If the battery terminals are corroded by acid, white flocculent or patina may form. Do not scrape them with hard objects; instead, clean them with hot water, but be careful to avoid excessive water that may leave acid residue on the vehicle frame.
I've been driving the Wuling Sunshine for many years and have encountered the issue of a falsely high temperature gauge. The most common cause is a faulty coolant temperature sensor, where the sensor probe tends to accumulate dust or the internal components age, sending incorrect high-temperature signals to the dashboard. Once during a long trip, the gauge showed the temperature was about to max out. I immediately pulled over to check, but the actual radiator temperature was normal—it turned out the sensor's connecting wire was corroded and short-circuited. A falsely high reading isn't a minor issue because it can make you mistakenly think the engine is overheating, delaying your trip and adding unnecessary stress. My advice is not to keep driving stubbornly. Instead, head to a repair shop to test the signal voltage with a diagnostic tool—the normal range is around 2-3V. If it's higher, replace the sensor. For regular maintenance, remember to clean the engine bay to prevent rainwater or mud from splashing onto the wiring, reducing such electrical faults. Periodically check if the wire connectors are loose. The Wuling Sunshine's electrical system is simplified but susceptible to environmental factors—small preventive measures can save you from big troubles.
