K 2500 Truck 4WD V8-454 7.4L VIN J SFI (1997)
Temperature Gauge: Description and Operation
Circuit Operation
The Engine coolant temperature is displayed by the TEMP Gage. The pointer of the gage is moved by current flow through two Coils and is similar in
operation to the Fuel Gage. The Engine Coolant Temperature Sender has a low resistance at higher temperatures. It has a resistance of approximately
49.5 ohms at 123°C (260°F). Its resistance increases at lower temperatures and is approximately 1305 approximately 49.5 ohms at 123°C (260°F). Its
resistance increases at lower temperatures and is approximately 1305 Ohms at 47°C (100°F). This causes the current through the sensor to increase as
the coolant temperature increases and the TEMP Gage pointer moves toward the hot end of the scale.
