I have a 2003 TrailBlazer, recently purchased it used, no Car Fax purchased before buying the Chevrolet. Has been running fine, a clicking noise every now and then from under the hood. Service Engine light came on when turning a corner this afternoon. Fluids look ok and are full, had to add a little bit of coolant. Belts are ok. Anything else I can check or I should do before taking it in for service? I had a MPV a few years ago that did this right under 80K miles (which the TB is at now -- about 78K miles) and all that was going on w/ it is that it needed the exhaust system serviced. Wondering if this happens w/ the Trail Blazers as well. Thanks for any tips, advice, etc.