2011 Lexus RX 450h Owners Manual - Page 713

5-2. Steps to take in an emergency STEP 5 Add power control unit coolant if necessary. Water can be used in an emergency if power control unit coolant is unavailable. (→P. 644) Have the vehicle inspected at the nearest Lexus dealer as soon as possible. n Overheating The following symptoms may occur when your vehicle is overheating: l Hybrid system output decreases. l Steam comes out from the engine area. 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 hood, do not open the hood until the 5 steam has subsided. The engine compartment may be very hot, causing serious injuries such as burns. l Check that the indicator on the "POWER" switch and the "READY" indicator are When trouble arises off. l For vehicles with a hybrid system, there are times when the gasoline engine auto- matically starts to run or the cooling fans suddenly start to operate. Do not touch or approach the rotating parts of the belt or fans. Doing so may lead to fingers, clothes or tools getting caught, resulting in injury. l Do not loosen the radiator cap while the hybrid system and radiator are hot. Serious injuries, such as burns, may result from hot coolant and steam released under pressure. 633