Low Engine Coolant Level Indicator

The Low Coolant level indicator for Diesel Engines only lights to warn the driver when the radiator has a low coolant level. Battery voltage is applied to the Low Coolant level Indicator Module when the Ignition Switch is in "RUN" or "START." The Low Coolant Level Indicator module monitors the resistance of the Low Coolant Level Sensor. The level sensor has a high resistance of 50,000 ohms or more when the coolant level is low. This is the setpoint at which the Low Coolant Level Indicator Module grounds the YEL/Blk (68) wire to light the Low Coolant lamp. An increasing coolant level can reduce this resistance to less than 10,000 ohms. The lamp is extinguished below approximately 50,000 ohms