One of the faults on my AC when I bought the car was cycling like you describe.
It was caused by the magnetic clutch on the compressor having worn and the gap being too big.
There is an explanation somewhere on the forum how to reduce the gap without removing the compressor by using cable ties on the clutch assembly.
That is the method I used and it has been working fine for years now.
The alternative is to remove the compressor and to re-shim the clutch.
Colin
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'82>'95 '76 244GL Auto: '95>'02 '86 360GLT: '02>'06 '92 440Xi: '04>'12 '88 240GL B200E Auto: '06>'12 '88 240GL B200E Man: '11>'19 V70 2.5D Auto
Volvo since '82.
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