How many coolant temperature sensors does the Vision have?
4 Answers
The coolant temperature sensor is located at the connection between the upper water pipe and the cylinder head or at the thermostat. Here is relevant information: 1. A temperature sensor (temperature-transducer) refers to a device that can sense temperature and convert it into an usable output signal. Temperature sensors are the core component of temperature measurement instruments, with various types. Based on measurement methods, they can be divided into contact and non-contact categories, and based on sensor materials and electronic component characteristics, they can be classified into thermal resistors and thermocouples. 2. The coolant temperature sensor is installed on the water jacket of the engine block or cylinder head, in direct contact with the coolant, to measure the temperature of the engine coolant. The electronic control unit detects the engine coolant temperature based on this change - the lower the temperature, the greater the resistance; conversely, the smaller the resistance. The electronic control unit uses this change to measure the engine coolant temperature as a correction signal for fuel injection and ignition timing.
I've actually looked into this. Older cars like the Vision are quite interesting. They only have one coolant temperature sensor installed on the engine, but many people often confuse it with the thermostat. Last time I helped my neighbor fix his car, he insisted the sensor was broken, but when we opened it up, we found it was just oxidized connectors causing poor contact. After cleaning the rust and reconnecting it properly, it worked fine, saving over 200 yuan. You should watch out for sudden spikes or constant low readings on the temperature gauge, especially if there's white smoke and a gasoline smell during cold starts - that's usually a sign of sensor failure. Mechanics say these sensors tend to fail after about ten years, so remember to have the technician check the wiring connections during routine maintenance.
As a veteran Geely Vision owner, let me show you under the hood: That small silver cylinder plugged into the wiring harness at the rear of the cast iron engine block is it, usually located near the thermostat. Once my car had unstable idling, and the OBD showed fault code P0117 - turned out its resistance value had drifted. Replacing it yourself is straightforward: first disconnect the negative battery cable, drain some coolant, then remove the old sensor with a 22mm socket. Remember to apply sealant on the threads before installing the new one, otherwise leaks may occur. Always opt for OEM parts - I learned this the hard way when an aftermarket sensor failed after just three months. After installation, top up the coolant and bleed the system, or your dashboard will surely give you attitude.
Experience from repairing dozens of Geely Vision models: The entire series is only equipped with a single coolant temperature sensor. The key point is that this sensor handles two tasks simultaneously! It sends signals to the dashboard and transmits data to the ECU. So if it malfunctions, not only will the temperature gauge fluctuate erratically, but it may also cause the fan to run wildly or the air conditioning to fail. The most bizarre case encountered: an internal short circuit in the sensor caused the ECU to misjudge high temperature, directly cutting off the air conditioning compressor. Focus on checking whether the connector pins have engine oil ingress—Geely's early design had poor sealing rings, and oil pan leaks could easily flow along the wiring. It's recommended to unplug and clean the connector every two years.
