I’m reading between the lines: The AC is short-cycling due to a low Freon charge. As the suction line pulls Freon from the evaporator, the pressure drops below the cutoff setting for the sensor. The system still cools, but is inefficient. Since any loss of refrigerant is the sign of a problem, the system needs to be checked.
I’m thinking the compressor is short cycling, or he’s observing the wobble before the clutch finally falls completely apart, since it’s impossible for the AC to cycle that quickly.
So now you know more about your auto air conditioner than you ever wanted to know.
You’re welcome….and I didn’t mean to hijack your post.