Why doesn't my A/C system no longer blow cold. I recharged it 3 days ago and

It may have a leak, 100 psi is not very much pressure, if it is on the high side, that should be more like 300. Is your compressor running?

Hello seems you may have a leak and you should add a/c tracer dye and you will needs a infared light to detect the leak.HAVE A BLESS DAY from DR.RECO.