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Hello and welcome
This groaning noise, is it there as long as the compressor is on? Does the a/c light blink? Have the Freon pressures been checked?
The light is blinking because there may be a problem with the compressor clutch or the compressor, the noise may be indication of a failing compressor, since the compressor is running it seems that there is enough Freon pressure to keep the clutch engaged, the compressor may not be providing enough pressure to circulate the coolant to make the system work and cool the evaporator. I would recommend having the a/c pressures checked to see what the compressor is actually doing as far as high and low pressures are concerned, this is usually the first thing I do when there is an a/c problem. Most auto repair shops will do a simple a/c diagnostic check ehich includes a pressure test, they may make a repair procedure for you but you can still reply here with the results and I'll be glad to give you another opinion.