Why does my 2004 F250SD 6.0 Liter AC blow hot with the low side pressure at 110?

Why does my 2004 F250SD 6.0 Liter AC blow hot with the low side pressure at 110?
the low side pressure should be no higher than 42 psi with the compressor running. if the a/c clutch is engaged, the orfice tube is bad or the compressor is bad