What does the blue color on the dashboard temperature gauge mean?

[SanClayton]

The blue dashboard temperature light indicates that the engine coolant temperature is currently too low. Here is relevant information: 1. The coolant temperature indicator uses a bimetallic strip sensor switch screwed into the cylinder block water jacket, which controls the red warning light (high-temperature indicator) on the instrument panel. 2. Within normal operating temperature range, the switch contacts remain open and the light stays off. When temperature exceeds normal levels, the switch arm contacts close to illuminate the red warning light. 3. Modern automotive engines are all water-cooled, relying on continuous coolant circulation to dissipate heat. The coolant follows two circulation paths in the engine: a major circulation and a minor circulation. The minor circulation occurs during cold starts when coolant bypasses the radiator, helping the engine reach optimal operating temperature faster.