GMC 2002 Yukon Denali Owner's Manual page 277

4. With the coolant surge tank pressure cap off, start the 5. Then replace the pressure cap. Be sure the pressure
-
engine and let it run until you can feel the upper cap is hand tight and fully seated.
radiator hose getting hot. Watch out for the engine
cooling fan.
By this time, the coolant level inside the coolant
surge tank may be lower. If the level is lower, add
more of the proper mixture to the coolant surge tank
until the level reaches FILL COLD mark.
5-18