You ar correct, as I am an A/C novice myself, I asked this same question when I was getting ready to recharge my system after re-installing a new compressor. My system was bone dry and I turned on the A/C and the compressor stayed engaged. This as I was told is normal function for these model year trucks. There is a single switch that supplies power to the compressor clutch and when this switch is made the compressor stays on always.
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