What type of coolant use in a 1999 Yukon Denali?

For a 1999 Yukon Denali, it is recommended to use a coolant that meets GM's specifications, typically a 50/50 mix of water and Dex-Cool antifreeze. Dex-Cool is an orange-colored coolant formulated for long-life performance and is designed to protect the engine from corrosion and overheating. Always check the owner's manual for specific recommendations and ensure the system is properly flushed and refilled when changing coolant.