A/c

Im haveing a issue with my 95 Blazer and want to know where to start. I turn on A/C its not cold at all I turn on heat it blows out the defroster and feet only. I turned them off and listened to it when I turned the knob to A/C it made a really slight Tick sound by the glove box. Is it common for these to leak freon? any suggestions would help!

For air flow problems- check vacuum lines under hood- trace from vacuum ball to intake manifold for breaks, burns, rotted rubber.

For a/c look fo loss of refrigerant as number one problem- look for the leak point- as in compressor shaft seal and compressor belly-- are they oil/greasy? if so there is your leak point.