1997 Lexus ES 300 User Guide 1 - Page 18

ENGINE CHECKING THE ENGINE COOLANT LEVEL If you can find no leak, have your Lexus dealer test the cap pressure and check for leaks in the cooling system. ! CAUTION To prevent burning yourself, do not remove the radiator cap when the engine is hot. Engine coolant selection Your coolant must contain ethylene-glycol antifreeze. In addition to preventing freezing and subsequent damage to the engine, this will also prevent corrosion. Further supplemental inhibitors or additives are neither needed nor recommended. Read the antifreeze container for information on freeze protection. Follow the manufacturer's directions for how much to mix with water. The total capacity of the cooling system is given on page 197. We recommend 50% solution be used for your Lexus, or a sufficient quantity to provide protection to about -35°C (-31°F). "
Resevior cap  Upper line  Lower line Park the vehicle at a level spot and look at the see-through coolant reservoir when the engine is cool. The coolant level is satisfactory if it is above the upper and lower lines on the tank. If the level is low, add ethylene-glycol type coolant. The coolant level in the reservoir will vary with the engine coolant temperature. However, if the level is on or below the lower line, add coolant to bring the level to the upper line. Use only ethylene-glycol type coolant. For information on ethylene-glycol coolant, see also "Engine coolant selection" described below. If the coolant level drops within a short time after replenishing, there may be a leak in the system. Visually check the radiator, hoses, radiator cap, drain cock and water pump. 204 NOTICE Do not use alcohol type antifreeze or plain water alone.