Coolant: Description and Operation

GM Goodwrench DEX-COOL was developed in order to last for 240,000 km (1150,00 miles) or 5 years, whichever occurs first. Follow the instructions in Draining and Filling Cooling System. Use only GM Goodwrench DEX-COOL(R) or HAVOLINE(R) DEX-COOL when adding or changing the coolant.

Notice: Antifreeze 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 antifreeze, as the freeze level rises rapidly after this point. Pure antifreeze will freeze at -22° C (-8° F).

A 50/50 mixture of ethylene glycol DEX-COOL(R) and water will provide the following protection:
^ Give freezing protection down to -37° C (-34° F)
^ Give boiling protection up to 129° C (265° F)
^ Protect against rust and corrosion
^ Help keep the proper engine temperature
^ Let the warning lights and gauges work as they should.