Section 13-05: Tachometer, Oil Pressure, Coolant Temperature Gauges/Warning Indicators | 1993 Mustang Workshop Manual |
The temperature indicating system is a magnetic-type indicating system, which consists only of the sending unit located in the engine block cylinder head or intake manifold on 5.0L and a temperature gauge in the instrument cluster and system wiring. The sending unit changes resistance according to the temperature of the engine coolant, which varies the current flow through the gauge. The pointer position varies proportionally to the current flow. The sender resistance is high when the coolant temperature is low, and low when the coolant temperature is high.
The position of the pointer of the magnetic gauge is not controlled when ignition is turned to the OFF position. It will move to the correct indication whenever the ignition is turned back to ON position.
The gauge pointer may indicate at the top of the normal band with the
coolant temperature within specification, under certain driving conditions such
as heavy traffic or stop and go driving in hot weather.