2004 Pontiac Vibe Owner's Manual - Page 237

When to Check and What to Use Refer to the Maintenance Schedule to determine how often you should check the fluid level in your master cylinder reservoir and for the proper fluid. See Part B: Owner Checks and Services on page 6-19 and Part D: Recommended Fluids and Lubricants on page 6-26. How to Check and Add Fluid Check to make sure that the fluid level is at or above the MIN mark. If the level is below the MIN mark, see the instructions on the reservoir cap. Engine Coolant The following explains your cooling system and how to add coolant when it is low. If you have a problem with engine overheating, see Engine Overheating on page 5-30. A 50/50 mixture of clean, drinkable water and the proper coolant will: Give freezing protection down to −34°F (− 37°C). Give boiling protection up to 265°F (129°C). Protect against rust and corrosion. Help keep the proper engine temperature. Let the warning lights and gages work as they should. 5-27