Under searing sun, your Toyota performs the way it always does-from the way it stops to turning. To build cars with a high heat tolerance we test them under external temperatures of 50 degrees centigrade, road surface temperatures of 75 degrees centigrade, and internal temperatures of 80 degrees centigrade to confirm the effects on the vehicle, its components and materials. We assess how the cooling system functions and the engine's performance on steep grades, in heavy traffic, at high speeds. So in all kinds of conditions, you can take the heat. That's what makes it a Toyota.