Coolant

This vehicle was manufactured with GM Goodwrench DEX-COOL TM. GM Goodwrench DEX-COOL TM was developed to last for 240,000 km (150,000 mi) or 5 years, whichever occurs first. Make sure only GM Goodwrench DEX-COOL TM (orange-colored, silicate-free) is used when coolant is added or changed. Follow the instructions in Draining/Filling Cooling System.

Notice: Pure coolant can be added to raise the boiling point of the coolant, but too much will affect the freezing point. Do not use a solution stronger than 70 percent, as the freeze level rises rapidly after this point. Pure coolant will freeze at -22°C (-8°F).
A 50/50 mixture of ethylene glycol (GM Goodwrench DEX-COOL TM) and water will provide the following protection:
- Give freezing protection down to -37°C (-34°F).
- Give boiling protection up to 129°C (260°F).
- Allow the sensors and switches to operate as designed.
- Protect against rust and corrosion.
- Help keep the proper engine temperature.
- Let the warning lights and gauges work correctly.