Buying a used car can be alittle scary if you don't posses a little mechanical knowledge. The first thing I would recommend is take it to a reputable shop. Inform them that you are considering buying this car. Ask them for a complete list of everything they see that can cause you a problem in the near future. And make sure they give you an estimate.
The things that you would want checked out are front end suspension components, brakes, electrical system, (blinkers, lights etc.) leaks such as antifreeze, oil, power steering, brake fluid, and gas leaks. You'll most likely get charged for one hour of diagnostic time.
With the estimate in hand you can let the seller know that the vehicle needs some work performed. You can either have him fix the vehicle or have him knock it off the price of the car. Ive personally used this strategy and it worked Very well. If you don't have the time, then take someone with you with a little mechanical knowledge.
The things you should do are first drive the car around town and down the highway. Listen to any noises when braking and going over bumps. Make sure all your lights and blinkers work. I’ve noticed in the past most used car dealers would have the engine compartment steam cleaned. With that in mind, I would drive the car a good ten or fifteen miles and then have the engine compartment inspected for leaks. (Engine oil, transmission fluid, rack’n pinion and power steering components).
After driving the car around town pop the hood open see if you smell any fluid burning or see any leaks. These leaks should show up now after driving the car awhile. After the test drive if you noticed any of these problems then have your mechanic inspect the vehicle.