Engine Cooling System: Maintenance Chevrolet Sonic I

Draining Procedure

1. Remove the coolant pressure cap from the radiator surge tank.
2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(ref-542467-S12591948612013041600000) .
3. Remove the front compartment front insulator cover. Refer to «Front Compartment Front Insulator Cover Replacement»(ref-542501-S04169640362013041600000) .
4. Place a drain pan under the drain cock.
5. Loosen the radiator drain cock (1).
6. Drain the cooling system.
7. Lower the vehicle.
8. Inspect the coolant.
9. Follow the appropriate procedure based on the condition of the coolant. Normal in appearance-Follow the filling procedure. Discolored-Follow the flush procedure. Refer to «Coolant System Flushing»(ref-542500-S11293033732013041600000) .

Coolant System Flushing

Note. 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 manufactures instruction. However, always remove the thermostat before back flushing the system.

1. Apply the parking brake.
2. Drain the coolant. Refer to «Cooling System Draining and Filling»(ref-542500-S12642615042013041600000) .
3. Fill the cooling system with clean drinkable water. Refer to «Cooling System Draining and Filling»(ref-542500-S12642615042013041600000) .
4. Start the engine and run at 2,000 RPM until the thermostat opens.
5. Turn OFF the engine.
6. Drain the coolant system. Refer to «Cooling System Draining and Filling»(ref-542500-S12642615042013041600000) .
7. Repeat the above procedure until the water from the coolant system is colorless.
8. Drain the coolant system. Refer to «Cooling System Draining and Filling»(ref-542500-S12642615042013041600000) .
9. Repeat the above procedure until the water from the coolant system is colorless. Refer to «Cooling System Draining and Filling»(ref-542500-S12642615042013041600000) .