Charge Air Cooling System Pressure Cap Testing (LM2)

Special Tools

• EN-24460-A  Cooling System Pressure Tester
• GE-46143-A  Cooling System Adapter

Equivalent regional tools: Special Tools

WARNING:

To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is hot. The cooling system will release scalding fluid and steam under pressure if radiator cap or surge tank cap is removed while the engine and radiator are still hot.

1. Remove the charge air cooler coolant filler cap.
2. Wash the charge air cooler coolant filler cap sealing surface with water.
3. Lubricate GE-46143-A  Cooling System Adapter and pressure cap O-rings with coolant and press cap to seat O-ring on GE-46143-A  Cooling System Adapter before turning to engage threads. Adhesives, Fluids, Lubricants, and Sealers

4. Courtesy of GENERAL MOTORS COMPANY

   Use the EN-24460-A  cooling system pressure tester (1) with GE-46143-A  Cooling System Adapter (2) in order to test the pressure cap.

5. Test the pressure cap for the following conditions:
   • Pressure release when the EN-24460-A  cooling system pressure tester exceeds the pressure rating of the pressure cap.
   • Maintain the rated pressure for at least 10 seconds.

     Note the rate of pressure loss.

6. Replace the pressure cap under the following conditions:
   • The pressure cap does not release pressure which exceeds the rated pressure of the cap.
   • The pressure cap does not hold the rated pressure.