Dex-Cool
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.
Factory says----5W30 in the winter time. Be sure to use A/C delco oil filter.
Dex-cool
DEXRON iii ATF
The factory coolant is a red, five year, HOAT type coolant.
Green.
Dexcool
More than likely Dexron 3. Call your local GM dealer to be 100% sure.
dexcool its the orange colored coolant
your question makes no sense, clocking is the position of the plug, not related to the size of the plug or type of connector.
green
R134