Please help me fix my factory 4 season air conditioning

[kookykrispy]

I searched for this, but didn't find anything. Anyways, my truck has the factory 4 season A/C. It doesn't work... the previous owner somehow 'rigged' the heater controls so that warm air always blows out the defroster... no matter what you set the levers at.

The hub of the compressor seems to be stuck. The fan belt is gone. There is a hardline missing that goes between the receiver/dryer and the condensor.

Where do I begin with this? I have NEVER worked on A/C before, but I want to learn how to fix this.

Hopefully someone can help. If there is already a thread on this, and somebody can please post the link, that would be very helpful.