Draining Procedure

WARNING: This page is about a different car, the 2022 Cadillac CT5. However, it is still accessible from the selected car via links, so may be relevant.

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.

NOTE:

Make sure the charge air cooling system is cool and that the pump is not activated.

Courtesy of GENERAL MOTORS COMPANY

Intake Manifold Cover (2) - Remove - Intake Manifold Cover Replacement
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Charge Air Cooler Coolant Filler Cap (1) - Remove
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Install the GE-47716-30A Vac-N-Fill Adapter (1) to the turbocharger coolant feed pipe fitting (2) to allow the system to vent.
Place a drain pan under the vehicle.
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Charge Air Cooler (1) - Remove - Charge Air Cooler Replacement - Left Side (LGY)
Rotate the auxiliary radiator outlet hose downward allowing the engine radiator (intercooler heat exchanger) to drain.
Invert the charge air cooler (1) and allow the remaining coolant to drain into the drain pan.
Courtesy of GENERAL MOTORS COMPANY

Charge Air Cooler (1) - Install - Charge Air Cooler Replacement - Left Side (LGY)