1994 Chevrolet Suburban Owner's Manual - Page 226

While filling the surge tank, watch to see if coolant begins to stream out the air bleed valve. When coolant begins to stream out, close the valve. 5. With the air bleed valve closed and the coolant surge tank pressure cap off, start the engine and let it run until you can feel the upper radiator hose getting hot. Watch out forthe engine fan( s). 6. 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 COLD mark. 7. Then replace the pressure cap. Be sure the arrows on the pressure cap line up like this. 5-23