Since it looks like you plan on DIY, why not just check the R134a refrigerant charge on the low pressure port. It will range from 35 - 55 psi depending on the actual ambient temperature. Unless it's prohibited by state or local law, Autozones, Advanced and even Walmart have re-charge kits with a pressure gauge or sell the gauge by itself. It's cheaper than taking it to a HVAC mechanic. Good luck!
Thrasher CAI, DHP v1.0 PCM, SLP Headers,
3.25 SC pulley, CAIT GMAF, 2.5 DP/Hi-Flow CAT,
u-bend delete, 160 TS, ZZP Stage 1 72mm TB,
TB spacer, MSD 8.5mm wires, Autolite 103,
Goodyear Gatorback Serp. & SC Belt,
Nitto NT555R Drag Radials
1/4 ET: 13.210 sec. @ 104.490 mph
0 - 60 ft: 1.945 sec.