54–02 Coolant Level Sensor
Cleaning
1. Drain enough coolant from the radiator to expose
the coolant level sensor.
2. Disconnect wire 173 from the sensor in the ra-
diator surge tank. Remove the sensor from the
surge tank.
3. Using a fine-grit sandpaper, clean the sensor un-
til the metal is exposed. Clean the tapped hole
with a wire brush.
4. Install the sensor (do not seal the sensor threads
with tape), and reconnect wire 173. Fill the cool-
ing system to the proper level.
5. Start the engine. The LOW WTR light and warn-
ing buzzer should be off. If the light and buzzer
are off, the sensor is okay. If the light and buzzer
are on, replace the sensor.
Electrical, Instruments, and Controls54
Business Class Trucks Maintenance Manual, January 199854/2
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