Assuming you have the ac delete bracket in place now, you would remove that and install a compressor.
You would also need to install a condenser and receiver drier. Next, you would decide if you want to install the (way it would have been from the factory) evaporator in your dash... OR get an underdash evaporator.
If you get an in dash unit, you'll need an expansion valve. If you do underdash, most come with it already.
Your evaporator choice will also determine if you need to purchase new HVAC controls or not.
From there, run the lines.
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