If your vehicle overheats The following may indicate that your vehicle is overheating. The needle of the engine coolant temperature gauge (Gauges and meters) enters the red zone or a loss of engine (hybrid system) power is experienced. (For example, the vehicle speed does not increase.) “ Engine Coolant Temp High Stop in a Safe Place See Owner’s Manual” is shown on the multi-information display. Steam comes out from under the hood. Correction procedures If the engine coolant temperature gauge enters the red zone or “ Engine Coolant Temp High Stop in a Safe Place See Owner’s Manual” is shown on the multi-information display Stop the vehicle in a safe place and turn off the air conditioning system, and then stop the hybrid system. If you see steam:Carefully lift the hood after the steam subsides.If you do not see steam:Carefully lift the hood. After the hybrid system has cooled down sufficiently, inspect the hoses, engine radiator core (radiator) and intercooler radiator core (radiator) for any leaks. If a large amount of coolant leaks, immediately contact your Toyota dealer. Cooling fan Radiator The coolant level is satisfactory if it is between the “ F” or “ FULL” and “ L” or “ LOW” lines on the reservoir. Engine Reservoir “ F” line “ L” line Power control unit Reservoir “ FULL” line “ LOW” line Add coolant if necessary. Water can be used in an emergency if coolant is unavailable. If water was added in an emergency, have the vehicle inspected at your Toyota dealer as soon as possible. Engine Power control unit Start the hybrid system to check that the radiator cooling fan operates and to check for coolant leaks from the radiator or hoses. The fan operates when the air conditioning system is turned on immediately after a cold start. Confirm that the fan is operating by checking the fan sound and air flow. If it is difficult to check these, turn the air conditioning system on and off repeatedly. (The fan may not operate in freezing temperatures.) If the fan is not operating:Stop the hybrid system immediately and contact your Toyota dealer.If the fan is operating:Have the vehicle inspected at the nearest Toyota dealer. Check if “ Engine Coolant Temp High Stop in a Safe Place See Owner’s Manual” is shown on the multi-information display. If the message does not disappear: Stop the hybrid system and contact your Toyota dealer. If the message is not displayed: Have the vehicle inspected at the nearest Toyota dealer. Warning: When inspecting under the hood of your vehicle Observe the following precautions.Failure to do so may result in serious injury such as burns. 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. After the hybrid system has been turned off, check that the “ READY” indicator is off. When the hybrid system is operating, the gasoline engine may automatically start, or the cooling fan may suddenly operate even if the gasoline engine stops. Do not touch or approach rotating parts such as the fan, which may lead to fingers or clothing (especially a tie, a scarf or a muffler) getting caught, resulting in serious injury. Do not loosen the coolant reservoir caps, while the hybrid system and radiator are hot.High temperature steam or coolant could spray out. Notice: When adding coolant Add coolant slowly after the hybrid system has cooled down sufficiently. Adding cool coolant to a hot hybrid system too quickly can cause damage to the hybrid system. To prevent damage to the cooling system Observe the following precautions: Avoid contaminating the coolant with foreign matter (such as sand or dust, etc.). Do not use any coolant additive.