| CAUTION | Do not add any engine coolant supplement sealant pellets to the cooling system. When adding coolant, it is important that you use GM Goodwrench Dex-Cool® coolant. |
Note. Recover and store used coolant in a used coolant holding tank and submit the used coolant for recycling on a regular basis. Do not pour used coolant down the drain. Ethylene glycol antifreeze is very toxic. Disposing of ethylene glycol into the sewer system or ground water is both illegal and ecologically unsound.
- Ensure the radiator drain cock is closed. Remove the radiator cap. Open the air bleed valve on the thermostat housing 2 full turns. Open the air bleed valve above the water pump 2 full turns. Slowly add a 50/50 mixture of GM Goodwrench Dex-Cool® and deionized water to the radiator until the coolant level is at the base of the radiator fill neck.
- Close the cooling system bleeder screws. Install the coolant pressure cap. Start the engine. Run the engine at 2000-2500 RPM until the engine reaches normal operating temperature. Allow the engine to idle for 3 minutes. Shut the engine off. Allow the engine to cool.
- Top off the coolant as necessary. Inspect the concentration of the engine coolant using Coolant Tester (J-23688). Rinse away any excess coolant from the engine and the engine compartment. Inspect the cooling system for leaks.