small spots of coolant by passenger inside/front of wheel is almost surely the aux fan switch o-ring that is in the lower radiator hose just aft of the radiator connection. Mine would only leak after the truck ran for at least 30 minutes. O-ring is not sold separately but the whole switch with o-ring is only about $15. however, swapping it out is a bit more involved. I did mine when I replaced all the cooling system hoses and radiator.