Checking Anti Freeze

Coolant Type
The cooling system has been filled at the factory with a high-quality, inhibited, year-around coolant that meets the standards of General Motors Specification 1825-M. This coolant solution provides freezing protection to at least 37°C (-3°F). It has been formulated to be used for two full calendar years or 48,000 kilometers (30,000 miles), whichever first occurs, of normal operation without replacement, provided the proper concentration of coolant is maintained.

Checking coolant level
The radiator cap should NOT be removed to check coolant level. Check the coolant level visually at the see-through coolant recovery reservoir. The level should be near the "COLD" mark when the system is cold. At normal operating temperature, the coolant level in the reservoir should increase to the "HOT" mark.

Adding Coolant
Coolant should be added ONLY to the reservoir to raise the level to the appropriate mark. Use a 50/50 mixture of high quality ethylene glycol and water for coolant additions.

CAUTION If recommended quality antifreeze (GM specification #1825-M, or equivalent) is used, supplemental inhibitors or additives claiming to provide increased cooling capability are NOT necessary. They may be detrimental to the efficient operation of the system, and represent an unnecessary operating expense.

Coolant Condition
While draining the system, check the color and feel of the coolant. If the coolant shows an unusual amount of oil sediment or feels slippery, engine oil may be leaking into the cooling system. A coating of oil on the inside of the coolant passages cuts down the efficiency of the system and may cause engine overheating. Also, a leak in the cooling system may cause coolant to flow into the oil passages, contaminating the lubricant and damaging the engine.