2007 Lexus GS 450h User Guide - Page 491

5-2. Steps to take in an emergency STEP 6 Add coolant if required. Water can be used in an emergency measure if coolant is unavailable. (→P. 484) Have the vehicle checked at your nearest Lexus dealer as soon as possible. n Overheating In the following situations, your vehicle may be overheating. l The message "HYBRID SYSTEM OVERHEAT" is displayed on the multi-infor- mation display. l The engine coolant temperature gauge enters the red zone or a loss of power is experienced. l Steam is coming from under the hood. CAUTION n To prevent an accident or injury when inspecting under the hood of your vehicle l Keep hands and clothing away from the fan and engine drive belt while the hybrid system is running. l Do not loosen the radiator cap while the hybrid system and radiator are hot. Serious injury, such as burns, may result from hot coolant and steam released under pressure. 476