Temperature Sensor (Gauge): Description and Operation

COOLANT (WATER) TEMP. GAUGE





The coolant temp. gauge is included in engine coolant temp. (ECT) sensor. This gauge activates a temp. meter in the instrument cluster.




DESCRIPTION OF CIRCUIT
The coolant (water) temp. meter is located in the instrument panel and its sender gauge on the inlet manifold. This circuit is as shown above.

The sender gauge shows different resistance values depending on the coolant temperature. This causes a current flowing through the temperature meter coil to change, controlling the meter pointer. That is, when the coolant temperature rises, the sender gauge resistance is decreased with more current flowing through the meter coil, thus allowing the meter pointer to move away from the "C" position.