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HI, sounds like the 4x4 switch on top of the transfer case is going bad.
It is easy to do, it is located on top of the transfer case and has a connector on top of it. Just disconnect the connector and unscrews the switch and screw the new one inb and hook it up.
The part is called the 4x4 position switch.
no cold air blowing out when ac is on but low pressure