Have you turned Heat/Cool knob to blue indicator ?
First of all close hot air/water pipe like a loop back. This pipe is used for heater and spoils most of cooling when A/c is functioning even when Knob is at blue. Even hot air is blocked when you turn hot/cool knob at blue but in case if Suzukis' it does not blocks hot air completely. In such a case, hot air from engine gets mixed with cold one from condenser resulting in neutral or hot air.
Does'nt helps, Clean front radiator DIY or do a profesional car wash.
If problem is still not solved, clean heat exchanger inside dashboard. Perhaps it is not easy 4 DIY.
If it does not helps, get your gas pressure checked.
If ok then ckeck for any choked filter for refrigant gas.
Still in problem, then compressor is the culprit.
Any professional would likely let you know if there is life left in compressor!
If you have extracted all of the juice from compressor for saveral years, Pls swtich to a newer compressor with R134a refregrant. Remember you will not get R1x refregrant after this year or so.