It makes sense to drive an older car for a number of reasons, most notably the savings of owning the car outright rather than making monthly payments and if you're comfortable with it, you don't need as much insurance as required by a loan provider. However, when a car gets to the point in which it is no longer reliable you may realize you need to reevaluate whether to continue driving the car at which point you have to make a decision about what to do with it.
Donate to Charity
One of the simplest ways to get rid of an old car which still runs is to donate it to charity. You can take a tax write-off for the gift, and they will typically pick it up and have the paperwork ready for you to sign the car over to them. Since they take care of everything, all you have to do is set a time convenient to your schedule to hand over the keys. In turn, the car will go to someone who is down on their luck, perhaps recovering from a serious illness, who needs something to drive until they can get back on their feet.
Have It Fixed
Even if you need another car for reliability, if you have room to store it and especially if the car has antique value you may decide to have it fixed and keep it as a back-up or to drive for fun on the weekend. Modern cars have safety features which make them more appropriate as a daily driver, especially if you have children, and they have conveniences which are important if you drive clients as part of your job, but fans and hobbyists are quick to declare how much more fun it is to drive an antique car.
Sell It to an Eco-Friendly Recycling Center
A third option is to sell the car for scrap metal to a recycling center. You'll know your disposing of it in a responsible manner as usable parts are refurbished and the metal is melted down to be reused. Much like a charitable donation you don't have the hassle of finding and negotiating with a potential buyer, rather, you call the center and they look up the weight of the car and tell you how much they can pay for it. If you agree, somebody will come by with a tow truck and the proper paperwork to transfer ownership so you have nothing to worry about.