Check the hoses under your hood every month or two to avoid the hassle of a broken hose while you're on the road. With the car cool and off, squeeze the hoses. If they are hard or make a crunching sound, replace them. Ditto if they are extremely soft or sticky with the car warm. With the vehicle off, examine hoses for bulges and collapsed sections. If you find any, the hose walls are weak, and it's time to replace the hose. Never drive with a ruptured coolant hose, or you are liable to overheat the engine and damage it. Other hoses are crucial to operation of your power brakes and cruise-control systems.