Follow Chevrolet on Facebook and on Twitter for the latest news and updates. Get Tips For Avoiding An Overheating Engine from AOL Autos. Sources say the normal range of temperature for a vehicle's engine is 195°F to 200°F, maintained with a mixture of 50% antifreeze and 50% water. When the temperature goes above 200°F, boiling of the coolant solution can cause overheating. An antifreeze/water 50-50 solution will boil at 225°F or so. Increasing the amount of antifreeze to 70% will increase the boiling temperature to 276°F. Engine oil also acts as a coolant and lubricant.