Water Temperature Gauge
- Water temperature signals are generated at the engine coolant temperature sensor on the engine, and after converted into digital signals, these signals are sent via the body integrated unit to the combination meter.
- The resistance of the engine coolant temperature sensor changes according to the engine coolant temperature. Therefore, the signals sent to the water temperature gauge also changes according to the engine coolant temperature. As the change in signals causes the magnetic force of the step motor to change, the gauge needle moves according to the engine coolant temperature.
- When the coolant is at a normal operating temperature of approx. 85 to 100°C (158 to 212°F), the gauge needle stays in the middle of the indication range as shown below.
Courtesy of SUBARU OF AMERICA, INC.