2010 Lexus SC 430 Owners Manual - Page 316

5-2. Steps to take in an emergency If your vehicle overheats If your engine overheats: Stop the vehicle in a safe place and turn off the automatic air conditioning control. Check to see if steam is coming out from under the hood. If you see steam: Stop the engine. Carefully lift the hood after the steam subsides and then restart the engine. If you do not see steam: Leave the engine running and carefully lift the hood. Check to see if the cooling fan is operating. If the fan is operating: Wait until the temperature of the engine (shown in the instrument cluster) begins to fall and then stop the engine. If the fan is not operating: Stop the engine and call your local Lexus dealer. After the engine has cooled down sufficiently, check the level of engine coolant and inspect the radiator core (radiator) for any leaks. Upper line Lower line Add engine coolant if required. Water can be used as an emergency measure if engine coolant is unavailable.(→P.232) 320 SC_U (OM24606U)