Hi Matt,
       Have you checked your high-side pressure?  It sould be like 200+ psi.
Your low side should be 40-ish.  If your sides are the same, your compressor
is bad.  Not leaking, but not pumping -- there is a drive shaft of sorts
inside that will break.  Aside from that, your expansion valve may be shot.
Check that pressure on the high side, located under the plastic cover on the
driver side.  That will tell all.

Bill Marshall