Few emergency car repairs can match the seriousness of overheating. Here’s a quick guide to dealing with a hot engine.

Overheating can be one of the most frustrating situations a driver can face, because it rarely occurs in a spacious parking lot next to a fully-equipped garage. Instead, cars tend to overheat on interstate highways, miles away from the nearest repair shop or water source. All a driver can do is allow the engine to cool down naturally and hope that the heat has not caused permanent damage. Sitting helplessly by the side of a road watching a car spew steam and smoke is no one’s idea of a relaxing vacation.

But it doesn’t have to be this way, as long as drivers take some precautions before leaving the driveway and pack certain supplies to deal with any eventuality on the road. Here’s a quick guide to dealing with an overheated car:

1. Preventative maintenance. Car engines are designed to handle the extremely high temperatures generated by internal combustion. A constant supply of engine coolant and/or water circulates around the engine block and keeps the temperature at a manageable level. This coolant returns to a radiator located in the front of the engine compartment. A radiator has a substantial amount of surface area in its fins and tubes, which allows heat to escape as the fluid is forced through the intricate system. A fan placed in front of the radiator also creates some ventilation. The cooled fluid then returns to the engine compartment and the entire process is repeated. As long as this circulation remains uninterrupted and the coolant level remains normal, a car should not overheat.

The first step towards preventing overheating is preventative maintenance. Radiators must be kept clean and intact in order to keep the coolant flowing. Any leaks or excess corrosion will affect the radiator’s ability to maintain a normal level of coolant. They need to be flushed out periodically to remove any contaminated fluids and then inspected for leaks. This can be done at home, but professional radiator shops provide this service for a fairly small fee. Small leaks can be repaired at the shop or through

the use of a commercial product designed to plug minor leaks.

Coolant levels must also be checked before taking a car out for an extended drive. The ratio of water to coolant varies from season to season, but most anti-freeze manufacturers publish this information somewhere on the container. Drivers can purchase a small device that measures the concentration of coolant and water. Radiators should be filled completely and the reserve tank (generally a plastic container near the radiator) should also be filled to the prescribed level. Any additional fluid should be added to this reserve tank- the radiator will draw up the additional coolant as needed.

Hoses should also be inspected for signs of tearing or loose connections. Most hoses are attached to the engine block with metal clamps that can be tightened easily with a screwdriver. Some hoses are specially designed to fit in very tight spaces, so a driver may not be able to inspect every single hose. Look for signs of excessive radiator fluid on the garage floor under the car’s front end by placing a large piece of cardboard while the car is parked.

2. Early warning signs. Older cars featured analog temperature gauges which rose as the car became warmer and ‘needled out’ whenever a car’s engine became overheated. Today’s cars still have a temperature gauge, but there are also several lights which indicate potential engine trouble. If the temperature gauge itself begins to move to the upper end of ‘Normal’, then try turning off the air conditioner. If the needle does not return to a more normal level, then the engine may be on the verge of overheating. If a light on the dashboard indicates engine trouble, it’s probably too late. Older cars sometimes have an Oil Pressure light that could also indicated some overheating. An overheating car will also begin to shudder and miss as the oil becomes thinner from the heat. Rods and pistons will begin to rub against their metal housings and could potentially break. The only thing a driver can do is pull over and shut off the engine.

3. Immediate actions. The first priority is to pull off to a safe location and alert other drivers to the emergency. Select a level spot safely out of the driving lanes and put on the emergency blinkers. Turn off the engine and carefully get out of the car after pulling the hood release. Lift the hood and make sure it is braced securely. There may be a lot of smoke and/or steam coming out of the engine block. Do NOT attempt to open the radiator cap or re-attach a loose hose at this point. Step away from the car and call your automobile service if you have one. Ideally, the car should be towed to a service station without restarting the engine.

If you cannot arrange for professional assistance, then prepare to wait out the problem. Eventually the smoke and steam will disappear and you may safely examine the situation. More than likely, the radiator has lost a lot of fluid which will need to be replaced. Always keep jugs of water or engine coolant stored in your trunk for such emergencies. Carefully remove the radiator cap ONLY if you can do so safely. Hot steam spewing out of a hot radiator can cause serious scalds. Add fluid until the levels are back up to normal. The radiator may continue to spew fluid, so make additions carefully and gradually. Once the radiator has been replenished, do the same with the reserve tank.

The engine may have also overheated because of a loss of oil. A driver should also keep a few quarts of oil in the trunk, especially during a long trip. The engine block will still be extremely hot, so carefully remove the dipstick to examine the oil level and condition. Replace the dipstick and CAREFULLY twist off the oil cap, using a rag or glove for insulation. You may see smoke pour out of the opening, along with signs of burned oil. Use a funnel and pour replacement oil until you’ve reached the car’s ideal level. Replace the oil cap tightly and move on to the hoses.

If a hose containing fluid breaks, the result will either be a constant stream of fluid coming out of the leak or an obvious separation of one end from the engine block or radiator. In an emergency, a driver may have to replace the end and re-tighten a clamp or patch the leak temporarily until the hose can be replaced. A good car repair kit should contain some clamps suitable for radiator hoses. Replace the old clamp with a new one, replace the hose end on the proper engine connection and tighten down with a screwdriver. For a leak, wrap the torn section with duct tape or a cloth arranged like a tourniquet. It doesn’t have to be perfect, just secure enough to survive a short drive to the nearest service station.

Once the leaks have been patched, the hoses have been re-attached, the oil has been checked and replaced and the radiator filled with fresh coolant or water, you may now attempt to restart the car. If the car behaves normally, drive directly to the nearest service station and tell the mechanic everything that happened. If the car refuses to start or makes loud clanking noises, shut it off and make arrangement for towing. Driving a car with low oil and heat damage can cause the rods to snap violently and crack the entire engine block. This is what experienced drivers call ‘throwing a rod’, and you don’t want it to happen in the middle of the desert.

4. Aftercare. Once you’ve had the car in the garage and the immediate damage has been repaired, it’s time to consider a few changes in your driving habits. An overheated engine is not going to perform nearly as well as one that has never overheated. Some parts may have warped from the heat, and the drive to the garage may have caused even more unseen damage. Most cars that have overheated can still perform well enough for daily commutes and the like, but they may not be the best cars for long distance trips. A driver needs to keep the car’s fluid levels topped off whenever possible, and old fluids such as oil and coolant need to be flushed out and replaced on a regular schedule. Air conditioning should be used a little more sparingly, and a damaged car should not be driven over the speed limit very often. If a car has overheated more than once, a driver may do better to rent or borrow a more reliable car for long distance drives.

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