1993 Oldsmobile Achieva Owner's Manual - Page 198
1993 Oldsmobile Achieva Manual
Page 198 highlights
Problems on the Road Engine Overheating (CONT:) 2. Then keep turning the pressure cap, 3. Fill the coolant surge tank with the proper mix, up to FULL COLD, or and remove it. just above the small cylinder at the Once the pressure cap is off, look base of the opening. inside the surge tank opening and look for a small cylinder at the base of the opening. This should be covered with coolant. If the cylinder is uncovered, the coolant in your system is low. 4. With the coolant surge tank pressure cap off, start the engine and let run it until you can feel the upper radiator hose getting hot. Watch out for the engine fan. By this time, the coolantlevel inside the coolant surgetank may be lower. If the level is lower, add more the of proper mix to the coolant surgetank until the level reaches FULL COLD, or just above the small cylinder at the base of the opening.