Low Engine Coolant Level Indicator

The low coolant level indicator only illuminates to warn the operator 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 the RUN or START positions. 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 CKT 68 (YEL/BLK) in order to illuminate the low coolant lamp.

An increasing coolant level can reduce this resistance to less than 10,000 ohms. The lamp turns off below approximately 50,000 ohms.