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Try this. Right click a surface on your heat sink and then pick invert selection. The invert selection selects all faces except the one you originally selected. Then, hold CTRL down and pick the original face you selected. Now you will have all of the surfaces of the part. You could also deselect faces that you don't want if necessary. Finally, apply your convection coefficient to the faces. It is important that you select the faces first, and then do the thermal parameters. If you first open the convection property, for some reason the invert selection option is not on the right mouse menue.
Hope this works for you. It was a tough one to figure out. I had a similar problem with a heat sink.