I have a 2000 Pontiac Bonneville with around 80,000 miles. It has been a great car but recently The steering wheel has started to click loudly when i turn the wheel. Can anyone tell me why its doing this and maybe how much to fix it?

It is a 1997 Pontiac Bonneville, and I need to locate this because the engine is overheating within the first 5 minutes of driving it.