Cooling System Bleeding: Notes
NOTE:
Some coolant manufacturers are mixing other types of glycol in their coolant formulations; propylene glycol is the most common new ingredient. Propylene glycol is not recommended for use in GM vehicles that were manufactured with GM Goodwrench Dex-Cool®.
CAUTION:
Avoid spilling coolant mixture on engine parts. Coolant may cause undue corrosion. If coolant is spilled during procedure, rinse area with clean water.
CAUTION:
Do not add cold water to the cooling system with the engine at or above operating temperature. Adding cold water causes rapid cooling, resulting in possible engine damage.