i hear it with the windows up or down. I beleive it is definitely with the fan. When I get to Rapid City, SD, I'm stopping at a Ford delaer to have it checked.
dont be so sure about that dodge not leaving you on the side of the road. as we all know now i drive a stupid dodge and it left me stranded last monday....still in the shop as of today...the old farm truck had to come save me (96 powerstroke 220,000 miles, never seen the bed of a wrecker) 5 months and counting til i can get another powerstroke!