Gilly, I didn't let it idle that long. I turned on the AC this time, and both fans came on instantly and run quietly/smoothly. Now what do we think it is? Car comes up to temp very quickly, and has been running just a tad hotter than it normal lately..

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2004 Ram 2500 Cummins HO
2000 Jetta TDI
1999 E300 (sold)