First replace the TURN SIGNAL FLASHER. Even if one side works the other side may not if the flasher is weak. Your car has a turn signal flasher and a hazard flasher and usually they are interchangeable but run separate circuits. Turn on the side that works and follow the clicking noise to track it down. If that does not do it, most of these problems are then generally located within the turn sinal switch in the column and the steering wheel will need to be pulled and the switch changed out.