My last car was a 1997 Jeep Cheroke sport 4-door 4x4........... 240,000 miles and not all on paved road! Traded it in last week for a 2006 Commander 3.7L 4x4. Love it, but one things seems to follow Jeep that I never hear discussed. In both trucks, old and new, when you turn on the fan for the defrost, heat etc... (sometimes without) there is an audible clicking or rattle on the passenger side that sometimes varies with the throttle. I had the same issue in my Cherokee Sport and never found the cause. My Dad the same issue in his 199 Grand Cherokee. I know someone else has to know about this, but I never see it discussed. I have mine in the shop as we speak............... anyone know what this is or how to stop it? I had the Truck three days, I love it so far, but far too early for this!