At around 6,000 miles I noticed an intermittent whining sound that got progressively worse resulting in overheating. The problem was a faulty fan clutch. Now at around 12,000 I had the very same problem and now getting the 2nd fan clutch replaced. Unbelievable. Has anyone else had problems with the Diesel's fan clutch? Any ideas on what could possibly cause two to fail in 12,000 miles? I don't do any towing or carry heavy loads.