SEAL 5482731 - Caterpillar

Pressurized System: Hot coolant can cause serious burns. To open the cooling system filler cap, stop the engine and wait until the cooling system components are cool. Loosen the cooling system pressure cap slowly in order to relieve the pressure.
Remove electrical power from the ECM. Note: Allow the engine to cool prior to removal of the cooling system pressure cap.
Check the coolant level. Refer to the Operation and Maintenance Manual for the proper procedure to check the coolant level. Expected Result:The coolant is at the proper level.Results:
OK - The coolant is at the proper level. Proceed to Test Step 4.
Not OK - The coolant level is low.Repair: Add coolant according to the procedure in the Operation and Maintenance Manual.There may be a leak in the cooling system. Identify the source of the coolant leak. Repair the leak.STOPTest Step 4. Disconnect the Coolant Level Sensor and Monitor the Status for "Coolant Level"
Connect the Cat ET to the service tool connector. Refer to Troubleshooting, "Electronic Service Tools".
Disconnect the harness connector for the coolant level sensor.
Restore electrical power to the ECM.
Monitor