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Hello, the most common cause of an ac compressor clutch cycling on and off when its on max ac and high fan speed would be either due to a low refrigerant charge of problem with the ac clutch coil being weak. Inspect for any leaks in the system first which would be fun since its a cutaway and possible an add on ac system tied to the main ac system. Look for signs of dirt/oil around the ac lines and compressor, condensor, coming out the evaporator drain.If you have a black light you can check for fluorescent dye or check for leaks with an ac sniffer.
You can check for power and ground at the compressor and monitor the accs pid to see if the pcm is getting an ac demand signal to engage the compressor. If its blowing cold eneough the pcm will turn off the compressor to keep the system from freezing up;