Repair Instructions: Flushing
WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Important:
- Do not use a chemical flush.
- 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 instructions. However, always remove the thermostat before back flushing the system.
- Block the drive wheels.
- Place the transmission in park (P) or neutral (N).
- Engage the park brake.
- 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. Refer to Draining & Filling Cooling System .
- Fill the coolant reservoir to the FULL HOT mark.
- Fill the cooling system. Refer to Draining & Filling Cooling System .