Clutch on our trucks is engaged continuosly when a/c is selected. Evaporator freeze-up in a properly functioning system is prevented by the poa (pilot operated absolute) valve.
I am too new to A/C to arm chair diagnose your problem. You can try asking over in the a/csource forum. Be prepared to provide high/low gauge readings though.
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The truck... you hear that? No really, you did hear that?!!!
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