I just noticed sounds lirking from under my hood. It only happens when the heater or air cond. is on. When the compresoor kicks in there is a clicking sound as well as another lower pitch sound that seems to be coming from my serpentine belt tensioner. But I'm not sure cuz it also sounds like it is coming from the power steering pulley. Should I just take it in? It's still under warranty. One last one. I put that Sea Foam cleaner in my engine and it worked great. Smoked out the entire garage...what a smoke show. Anyways, I still have somewhat of a rough idle. Almost like a miss. Could the plugs be fouled out??