GM Repair Questions? Ask a Mechanic for Answers ASAP
Some have a Drain Cock on the Driver side bottom, facing the engine. Some don't & the Lower Hose needs to be removed to drain
Remove the coolant pressure cap.
Place a drain pan under the drain cock.
Open the radiator drain cock.
Drain the cooling system.
If a complete engine block drain is required, remove the knock sensors.
Inspect the coolant.
Follow the appropriate procedure based on the condition of the coolant.