This vehicle has a newly developed engine coolant. GM Goodwrench®
DEX-COOL® was developed to last for 240 000 km (150,000 mi)
or 5 years, whichever occurs first. Follow the instructions in Draining and
Filling 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 percent, 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. |
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).
