Temperature Gauge
System consists of a variable resistance type sending unit and a gauge. As coolant temperature increases, resistance in sending unit decreases allowing an increase of current flow and gauge pointer movement. It is possible, under certain driving conditions, for pointer to read at the top of the normal band and still have coolant temperature within limits.
NOTE:
On models with Automatic Temperature Control type air conditioning systems, the temperature sending unit has 2 terminals. The terminal marked "R" (gauge equipped) or "C" (indicator lamp equipped) provides a ground circuit for cold engine override (below 115°F or 46°C engine temperature) of heater blower motor.