Buick 1993 Skylark Owner's Manual page 204

4.
5. By this time, the coolant level inside the coolant
surge tank may be lower. If the level is lower, add
more of the proper mix to the coolant surge tank
until the level reaches the split line formed by the
black and white part of the tank.
With the coolant surge tank pressur\e cap off, start the
engine and let it run until you can feel the upper
radiator hose getting hot. Watch out for the engine
6.
Then replace the
pressure cap. Be sure
the pressure cap is tight.
fan.
203