Engine Coolant Level Indicator

The Engine Coolant Level Indicator comes on to warn the driver when a low level of coolant exists in the radiator Battery voltage is applied to the Engine Coolant level Indicator Module. When a low coolant condition exists. a signal is sent to the Engine Coolant Level Indicator Module from the Engine Coolant Level Sensor. The Engine Coolant Level Indicator Module will provide a ground to the Engine Coolant Level Indicator.

The Engine Coolant Level Sensor is not a switch that opens and closes. It has a very high resistance to ground, more that 50,000 ohms when the engine coolant level is low. This causes the Engine Coolant Level Indicator Module to illuminate the Engine Coolant Level Indicator. With more of the Sensor covered by coolant, its resistance decreases When the fluid level is good, the resistance will be less than 10,000 ohms. With the Sensor resistance between 10,000 and 50,000 ohms, the Sensor is partly covered and the fluid is not low enough to cause the warning to be displayed.