Ok, I just charged my AC with some R12, and I thought that would solve my problems. But it still doesn't out out cold air. I noticed that the clutch(it's that triangle thing, right?) on my compressor only engages for a little bit and then it slips. Should this be happening, and if not, then how can I fix it?

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85 z28 305 4bbl carb

 

Your low pressure cutout on the accumulator is probably shutting off the compressor after it suck the low side down. Chances are, you need more refrigerant, but use a gauge mainfold to monitor pressure when you top it off.