1994 Buick Skylark Owner's Manual - Page 195

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 thelevel reaches the split formed by the line black and white part of the tank. 5. Then replace the pressure cap. Be sure the pressure cap is tight. 4. With the coolant surge tank pressure cap off, the start you engine and let it run yntil can feel the upper radiator hose getting hot. Watch out~'for engine the fan.