My car is overheating, what should I do?

If you're driving at normal highway speed and your vehicle starts to overheat, turn off your air conditioning and then turn on the heater and immediately (or as soon as you can safely) pull over to the shoulder. It's likely that if your car starts to overheat at highway speed, there's a problem in the cooling system such as low coolant, a clogged radiator or a broken drive belt or a coolant leak, like from a burst hose. Once you are safely at the shoulder, shut off the engine, open the hood and let the engine cool down – 20 minutes minimum (the car can actually get hotter before it cools off). As soon any over boiling stops and the engine has cooled, look for any obvious signs of trouble, such as a pool of coolant or a broken belt. DO NOT attempt to open the radiator cap unless the engine is off and the top of the radiator is cold. If there is no noticeable problem you can then add a coolant/water mixture to the radiator or overflow reservoir, start the vehicle and drive slowly to a service facility. Running the car when it's overheating can severely damage the engine, to the point that a whole new engine is required.