Clicking in engine
I noticed today that I could hear a "clicking" noise coming from the engine compartment that I did not notice before. The noise can be heard from inside the vehicle and outside as well. With the hood open, it sounds as if it's coming from near the firewall towards the middle. It's not really loud, but is loud enough to be noticed. I have no idea what could be causing this. I also noticed, after driving 35 miles at highway speed, and popping the hood, a SIGNIFICANT amount of heat coming from the engine compartment. It seemed unusual and did not cool down very much while the vehicle was still running. The engine seems to also be running a little more rough than usual. With these symptoms, does anyone know what the problem may be, if any? We just had the Nissan 30K mile service done. There is no difference in the vehicle's performance during movement.