K 2500 Truck 4WD V8-379 6.2L DSL VIN C FI (1989)
Coolant Level Indicator Lamp: Description and Operation
This system uses a sensor mounted on the radiator and an indicator light mounted in the instrument panel to warn the driver if coolant level is too low.
This light is wired in series with the ignition switch, ECM and the sensor. When the ignition switch is turned to the crank position, the circuit is
energized and the indicator light will illuminate. When the ignition switch is turned to the ON position and coolant level is sufficient, the sensor will
indicate this to the ECM and the light will turn off.
