Turn off the AC and open the windows. Crank the heat and fans all the way up–this draws heat from your engine. Turn on your hazards and drive at a slow, constant pace until you can stop. [1] X Research source
Turn the engine off and leave the key in the ignition in the “on” position. Your lights, dashboard, etc. , should still be on. This will allow the cooling fans to continue running without running your engine, which will help speed the cooling process. Let the engine cool completely before you touch the engine or open the radiator cap. This cooling process could take as long as 30-45 minutes, but will save you from dangerous burns. [2] X Research source
Use a rag or towel when you handle this hose, as it can be very hot.
An overheated engine may have coolant as hot as 260F. Inside a sealed system, it will not boil. However, once exposed to the air it will flash boil and can cause severe burns. Wait until the system is cool.
Coolant usually smells sweet, and can show up on hoses, under the car, or around the radiator cap. It flows more like water, unlike oil which has a thicker consistency. Coolant is often green for older models, but the color of coolant can vary depending on your car’s make and model.
In a tight pinch, just water can substitute for coolant, though you don’t want to use it for too long.
If you must drive the car, be sure to let it cool as much as possible before restarting.
If the car does not overheat again, you may have had a one-time overheating due to a variety of factors (AC on, hot day, stop and start traffic). Still, you need to keep your eyes on the temperature gauge whenever possible to avoid more issues. Most cars are calibrated to sense overheating before serious engine damage, giving you some time to fix the problem. This does not, however, mean you should ignore your gauges. [6] X Research source
Turn the vents to point out the window to prevent things from getting too hot in the cab. [7] X Research source Alternately, you can set the heat to the “defroster” setting to avoid it blowing directly on you.
Making checking your temperature gauge a regular habit at red lights and stop signs.
If you are very late for an inspection, find a leak in your radiator, have unresolved AC issues, or are low on coolant, try not to use the AC at all. [11] X Research source
You should hear your fan whirring after you’ve turned you car off, as it is still working to cool your car off. [12] X Research source
When checking the coolant, take 2-3 minutes to search for any leaks as well. Coolant is usually green and smells sweet. Check under the car, around the engine, and on any hoses or radiator parts that you can see.
Extra coolant. A gallon of water. A tool-kit. A flashlight. Non-perishable food. A blanket. A straight razor blade. Duct tape. Philips and flat head screwdrivers.
