2009 Lexus GS 450h Owners Manual - Page 616

5-2. Steps to take in an emergency STEP 6 Add coolant if necessary. Water can be used in an emergency measure if coolant is unavailable. (→P. 569) 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 engine coolant temperature gauge enters the red zone or a loss of power is experienced. l Steam is coming from under the hood. l The message "HYBRID SYSTEM OVERHEAT" is displayed on the multi-infor- mation display. CAUTION n To prevent an accident or injury when inspecting under the hood of your vehicle l If steam is seen coming from under the food, do not open the food until the steam has subsided. The engine compartment may be very hot, causing serious injury such as burns. l Keep hands and clothing away from the fan and engine drive belt while the hybrid system is operating. 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. 558 GS_HV_U (OM30B44U) March 8, 2010 10:03 am