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. |
- Block the drive wheels.
- Place the transmission in park (P) or neutral (N).
- Engage the park brake.
- To run the generator control module (GCM) coolant pump, perform the following steps:
| 4.1. | Install the scan tool. |
| 4.2. | Turn the ignition ON with the engine OFF. |
| 4.3. | With the scan tool set to Powertrain, Alternative Fuels, Special Functions, SGCM Output Controls, command the GCM pump speed ON for 1 minute. |
| 4.4. | Turn the ignition OFF. |
- Follow the drain and fill procedure using only clean drinkable water. Repeat the procedure if necessary, until the fluid is nearly colorless. Refer to
Generator Control Module Cooling System Draining and Filling
.
Notice: The procedure below must be followed. Improper coolant level could result in
a low or high coolant level condition, causing starter/generator control module damage.
- Fill the cooling system. Refer to
Generator Control Module Cooling System Draining and Filling
.
