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I Hate to be the bearer of bad news; sounds as if your air compressor is bad!~ CHECK IT OUT! Talk soon~ L
Bad compressor
To help dehumidify the air
comp may cycle when you have the defroster on
If the AC pulley is locking up when the ac compressor clutch engages, it's not a clutch problem, it's a compressor problem. But yes, the AC clutch can usually be replaced separately. The problem is, if the clutch is worn out the compressor is probably worn out as well. It usually isn't that much more to replace the whole thing.
AC compressors will cycle like that when there is insufficient refrigerant.
The ac compressorThe ac compressor
You probably need a new air filter for your a/c The clicking is probably caused by the clutch on the compressor. If the Ac isn't charged enough it could cause this to kick the compressor off and on. You compressor could also be bad. You werent real clear what the problem was. Hope this helps.
might need to reset the problem indicator
The cycle switch not engaging the Compressors clutch
Some a/c compressors cycle on and off to maintain a set temperature.
I apologize if I do not understand what you are asking but if the a/c compressor will not cycle then you will need to check the pressure switch but on some of the GM cars and trucks they have what is called a variable displacement compressor, meaning that the a/c compressor with not cycle while its on.......