Temperature Gauge: Description and Operation

The engine coolant temperature indication system is a magnetic-type indication system consisting of:
- the water temperature indicator sender unit located in the engine block or cylinder head
- an Engine Coolant Temperature Gauge in the instrument cluster

The water temperature indicator sender unit operates as follows:
- changes resistance according to engine coolant temperature, which varies the current flow through the engine coolant temperature gauge.
- the pointer position varies proportionally to the current flow.
- resistance is high when the engine coolant temperature is low, and low when the engine coolant temperature is high.
- the pointer of the magnetic engine coolant temperature gauge remains in position when ignition switch is turned to OFF.
- pointer will move to the correct indication whenever the ignition switch is turned back to RUN.
- pointer may indicate at the top of the normal band with the engine coolant temperature within specification, under certain driving conditions such as heavy traffic or stop-and-go driving in hot weather.

ENGINE COOLANT TEMPERATURE GAUGE
The Engine Coolant Temperature Gauge is identified by a thermometer symbol:
- "H" means high temperature
- "C" means low temperature
- the solid band between C and H is the normal temperature range