Water Temperature Gauge
The water temperature gauge is a cross-coil type. Its signal is sent from the thermo gauge that is located on the engine. The thermo gauge's resistance changes according to the engine coolant temperature. Therefore, the current sent to the water temperature gauge also changes according to the engine coolant temperature. As the change in current causes the magnetic force of the coil to change, the gauge's needle moves according tot he engine coolant temperature. When the coolant is at a normal operating temperature of about 158 to 212°F (70 to 100°C), the gauge's needle stays in the middle of the indication range shown in Fig 1 .