hotskillet,
On my 83 SD, I had leaks on the manifold hoses and the thermo expansion valve (located next to the evaporator under the dash). Look for oily residue near connections and on the large hoses. Small ones carry liquid and are less likely to leak. The R-4 compressor can also be a source of leaks. If you have the system recharged, be sure to have the flourescent dye put in. Much easier to find the leaks. Hope this helps

__________________
D. Blake
86 300SDL 340K (for sale)
83 300SD 205K (gone)
06 Chevy K3500 LBZ CCLB 50K
94 Chevy K2500 6.5L TD 250K (gone)