I have no visible leaks and the truck runs great... no over heating. Heat works great. I have no idea where the smell is coming from, But I can only smell it when I am outside the truck. I am confused... any help would be greatly appreciated.

 

Check the radiator for small leaks, maybe a stone hit the front? Also check along the bottom of the radiator for signs of corrosion coolant could be seeping out without leaving any drops on the ground.

-Jon

 

Oh yeah, there's a little hole in the bottom of the water pump, see if that area is wet or discolored from coolant running out. when that leaks it means the water pump is shot.

-Jon