Bronco L6-300 4.9L VIN Y 1-bbl (1983)
Temperature Gauge: Testing and Inspection
Electrical Temperature Gauges
This temperature indicating system consists of a sending unit, located on the cylinder head, electrical temperature gauge and an instrument voltage
regulator. As engine temperature increases or decreases, the resistance of the sending unit changes, in turn controlling current flow to the gauge. When
engine temperature is low, the resistance of the sending unit is high, restricting current flow to the gauge, in turn indicating low engine temperature. As
engine temperature increases, the resistance of the ending unit decreases, permitting an increased current flow to the gauge, resulting in an increased
temperature reading.
TROUBLESHOOTING
A special tester is required to diagnose this type gauge. Follow instructions included with the tester.
