Coolant: Description and Operation

This vehicle has a newly developed engine coolant. GM Goodwrench DEX-COOLS was developed to last for 240,000 km (150,000 miles) or 5 years, whichever occurs first. Follow the instructions in Draining and Filling Cooling System in Cooling System. Make sure only GM Goodwrench@ DEX-COOL@ (silicate-free) or HAVOLINE DEX-COOL is used when coolant is added or changed.

A 50/50 mixture of ethylene glycol (DEX-COOL@) and water will provide the following protection:

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%, as the freeze level rises rapidly after this point. Pure coolant will freeze at -22°C (-8°F).
^ Give freezing protection down to -37°C (-34°F).
^ Give boiling protection up to 129*C (260*F).
^ Protect against rust and corrosion.
^ Help keep the proper engine temperature.
^ Let the warning lights and gauges work correctly.