How to Read the Water Temperature Gauge on a Car Dashboard?
2 Answers
The indicator symbols for the water temperature gauge on a car dashboard may vary, but the criteria for determining the water temperature are the same. Generally, the ideal position is in the middle, around 90°C. The engine coolant temperature should not be too low or too high; it must stay within a certain range. The normal temperature is indicated by the central position of the needle at 90°C. After starting the vehicle, the antifreeze temperature rises quickly. Once the needle reaches the central position, the heat exchange balance stabilizes, and the antifreeze temperature stops increasing. Typically, the best time to start driving is when the temperature reaches the middle position. The car dashboard is a device that reflects the working conditions of various vehicle systems. Common indicators include the fuel indicator, washer fluid indicator, electronic throttle indicator, front and rear fog light indicators, and warning lights. Different cars have varying dashboard configurations. However, conventional gauges in most cars include the speedometer, tachometer, oil pressure gauge, water temperature gauge, fuel gauge, and charging gauge. Beneath the dashboard panel, modern cars feature various indicator or warning lights, such as the coolant level warning light, fuel level indicator, washer fluid level indicator, charging indicator, high/low beam indicator, transmission gear indicator, Anti-lock Braking System (ABS) indicator, traction control indicator, and airbag (SRS) warning light. The sensor for the water temperature gauge is a thermistor-type sensor, which is fixed to the engine coolant passage with screws. The thermistor determines the current flowing through the coil windings of the water temperature gauge, thereby driving the needle movement. In the past, tap water was used as the cooling fluid for car engines. Nowadays, many car engine cooling systems use specialized coolant, hence it is also referred to as the coolant temperature gauge.
As a seasoned driver with over a decade of experience, I can tell you that the water temperature gauge is that thermometer-like indicator on the dashboard. During normal driving, the needle should stay in the middle zone. If it leans to the left, it means the engine is too cold, which is common when starting a cold engine. If it moves to the right towards the red line, you need to be cautious. Once during a long trip, my needle suddenly hit the red zone, so I immediately pulled over, turned off the engine, and checked—it turned out the radiator was leaking. Remember, never open the radiator cap when it's overheating; the steam can cause severe burns. Nowadays, new cars also have a water temperature warning light—if it turns red, it's an emergency, and you must stop immediately to address the issue. When washing your car, take a moment to check if the coolant level is sufficient; if it’s too low, you’ll need to inspect for leaks.
