2008 Lexus LS 600h Owners Manual - Page 628

5-2. Steps to take in an emergency n Overheating The following symptoms may occur when your vehicle is overheating: l Hybrid system output decreases. l Steam is coming from the engine area. CAUTION n To prevent an accident or injury when inspecting under the hood of your vehicle l With a hybrid vehicle, there are times when the gasoline engine automatically 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 an accidental injury. l Do not loosen the coolant reservoir cap while the hybrid system and radiator are hot. Serious injury, such as burns, may result from hot coolant and steam released under pressure. NOTICE n When adding engine/power control unit coolant Wait until the hybrid system has cooled down before adding engine/power control unit coolant. When adding coolant, do so slowly. Adding cool coolant to a hot hybrid system too quickly can cause damage to the hybrid system. 634