By Debbie Murphy/autoMedia.com
Here's where pre-planning comes in handy. Call for help. That may be in the form of a friend, an auto club or your trusted mechanic. Avoid dialing 911 unless there is immediate danger to you or passing motorists. Some state freeways have call boxes, but be cautious if you've broken down at night with no call box in immediate sight. Now, for specific breakdown scenarios:
An obvious sign of overheating is either the temperature warning light or a temperature gauge needle that's into the red area. Steam billowing out from underneath the hood is a pretty good clue as well. Pull over as soon as you safely can and shut off the motor. If you see or smell steam, raise the hood and check for a broken hose, leaking radiator or engine core plug. Check the engine drivebelt that operates the water pump. If you identify a major leak or broken drivebelt, don't try to drive the car. Get help.
Do not ever remove the radiator cap while the engine is hot or even warm. When you've checked for possible leaks or broken belts and everything is intact, wait until the top radiator hose is no longer hot to the touch (about 30 minutes) before you check the radiator. When the engine has cooled, you can add water to the cooling system through the coolant recovery, or overflow, reservoir under the hood. You may not have to deal with the radiator at all.
After you've been on the side of the road for half an hour and added water to the reservoir, you still may not be able to figure out why you've overheated. It's probably safe to restart your engine and proceed to a facility to get the vehicle checked out. Be prepared to pull over and let the engine cool if it continues to overheat.
With an electrical problem, the charging system warning light will come on, or you've noticed your gauge is hovering low. Pull off the road safely, but don't turn off your engine. The process of starting an engine requires a significant amount of juice, which now may not be available. The first thing to check under the hood is the fan belt—the one that drives both the alternator and the water pump. If this belt is broken, go ahead and turn off the engine. You're not going anywhere because if your vehicle isn't overheating, it soon will.
If this belt is intact, then turn off everything but your engine, such as your air conditioner or heater and radio. You may not have the option of turning off your headlights or windshield wipers, but if you can safely drive without them, do. Your alternator or generator is dead, but your engine can drive off of a fully charged battery for about an hour (assuming that it has a full charge).
When the red brake warning light comes on, you may still have some braking power (let's hope so!), but it is probably reduced and you will require much greater braking distance. Get off the highway, using your emergency brake if necessary. Ease the parking/emergency brake lever on, keeping your finger on the release button. When you feel the brakes start to lock up, release the button and start again.
If you're in heavy traffic, turn on your flashers and/or use your horn to alert surrounding motorists that you've got a problem. There are some situations where you can get to help with a failing brake system. For instance, if the brake caliper is broken and you've leaked brake fluid, a few quick pumps of the brake pedal can get the pressure back up. But if at all possible, just stop the car and call for help.
Obviously, we haven't covered all the possible causes of breakdowns, just a few of the most common. The best test for whether you should tough it out and drive to help, or give up and pull off the road, is the degree of danger to which your vehicle's malfunction exposes you and other motorists. It's always better to err on the side of safety.