At the summer and winter solstice, the Sun is directly over the equator.
Currently, there are signs of wind on Pluto, but no evidence yet, until the NASA spacecraft arrives there in 2015. To have "wind" on the surface of any planet requires the presence of an atmosphere. If an atmosphere exists, then there will be areas of higher and lower pressure and therefore a pressure gradient between the two points, hence a wind blows to equalise pressure overall. Given the outgassing that accompanies Pluto's closest approach to the Sun, there may be measurable flows of sublimated gases.