2010 Toyota Highlander Owners Manual - Page 570

5-2. Steps to take in an emergency STEP 6 Add engine coolant if necessary. Water can be used in an emergency if engine coolant is unavailable. (→P. 558) Have the vehicle checked at the nearest Toyota dealer as soon as possible. n Overheating If you observe the following, 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. 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 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 other belts while the engine is running. l Do not loosen the coolant reservoir cap while the engine and radiator are hot. Serious injury, such as burns, may result from hot coolant and steam released under pressure. 546