Why does the car's water temperature always stay at 0?

1 Answers
AdalineFitz
07/30/25 7:23am
Confirm that the radiator is not short of water. Here are the specific details: 1. Water temperature gauge: Especially for older analog pointer-type water temperature gauges, the bottom of the scale is not '0' degrees Celsius but approximately 40-50 degrees. This means that unless the temperature exceeds 40-50 degrees, you won't see the pointer move. So, it's possible that after 'starting the engine for a long time,' the water temperature hasn't reached 50 degrees, but it 'staying at 0' is impossible. You can use a Bluetooth OBD adapter to directly read the water temperature value from the ECU, which is much more accurate than the dashboard and provides a digital reading, eliminating the need for guesswork. 2. Solution: Monitor the engine oil temperature to determine the engine's operating condition. If the oil temperature is very high (around 110-120 degrees) but the water temperature hasn't risen, there might be an issue with the coolant circulation. Check if hot water is flowing into the upper radiator hose. If hot water is being injected but the temperature remains low, inspect the temperature sensor, wiring connectors, and dashboard.
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