Repair Instructions: Flushing
WARNING: This page is about a different car, the 2023 GMC Savana 3500, 2023 GMC Savana 2500, 2023 Chevrolet Express 3500, and 2023 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
- When the cooling system becomes contaminated, the cooling system should be flushed thoroughly to remove the contaminants before the engine is seriously damaged.
- This procedure is effective in removing contaminants caused by the use of improper coolants, coolant at the end of its life, or some liquid chemical flushing agents. This procedure is NOT effective for removing debris contamination caused by component failure, or the use of "stop leak" additives. When the system is contaminated by this type of debris, use the system flow diagrams to identify components that may need replacement to restore proper system flow.
- Do not use chemical flush agents.
- Store used coolant in the proper manner, such as in a used engine coolant holding tank. Do not pour used coolant down a drain. Ethylene glycol antifreeze is a very toxic chemical. Do not dispose of coolant into the sewer system or ground water. This is illegal and ecologically unsound.
- Various methods and equipment can be used to flush the cooling system. If special equipment is used, such as a back flusher, follow the manufacturer's instruction. Always remove the thermostat before flushing the cooling system.
- Place the transmission in Park and apply the parking brake.
- Block the drive wheels.
- Run the engine until the thermostat opens.
- Stop the engine.
- Follow the drain and fill procedure using only clean drinkable water. Repeat the procedure if necessary, until the fluid is nearly colorless. Cooling System Draining and Filling (Static L8T, LV1) , or Cooling System Draining and Filling (GE47716 L8T, LV1)
- Fill the cooling system to the proper level. Cooling System Draining and Filling (Static L8T, LV1) , or Cooling System Draining and Filling (GE47716 L8T, LV1)