Ok so my sidekick doent have air didnt come with it at first didnt bother me at all but now I have KIDS so!!!!!!!!!!! Well i bought a parts truck last week to get the parts i need for mine. It has working air every thing is good. how hard would it be to convert over anyone ever done this. Just wondering Thanks

Never converted over to it, but I've had to work on mine a  few times and can tell you it won't be a cake walk. Just transfering the condensor and fan, pump, brackets and hoses, dryer, and related stuff will probably take a 12 hour shift.

well i dont have the core support or inner fenders in at the moment and now would bew the time to do it

just take the doors off 

You will need to pull out your entire heater system, pulling your dash is going to be the best approach.  I'm not sure if you will need to punch holes in your firewall though.

You will also need to swap part of the dash out, I'm not sure if there is a difference in computers though.  The A/C button turns on the front electric fan but I believe that is just wiring.

The firewall holes should already be there.  There should be rubber plugs in them that can be popped out.
The engine ECM is the same. 
There will be a coolant temp sensor that will have to be added to the passengers side of the intake manifold (compare the 2 manifolds and you will see it...the non-AC trackick will just have a plug in the hole).  IIRC, the wire going to the sensor is yellow with a blue stripe.
I believe the main parts of the wiring harness is the same and the AC wiring just plugs into it...so you should be able to unplug the AC wiring and add it to your wiring harness.  If not, then I guess you'll have to swap wiring harnesses.

No one's mentioned it yet - so maybe I should    hopefully I'm not stating the obvious.

A/C work requires access to perhaps specialist equipment & skills, at least, if it's going to be done properly - it's illegal (in most countries) to vent refrigerant to the atmosphere so the system will need to be purged and the refrigerant captured before it can be disassembled, the lines and components will need to have the connections plugged or capped to prevent the ingress of moisture and/or debris, and after reassembly, you'll need to evacuate, test for leaks and then recharge.

Replacement of the receiver/dryer whilst you have the system apart would also be a good idea.

If you lack the skills & equipment, and a friend or buddy with them, try to find a shop who will work with you to handle the capture & recharge side of it, and let you handle the disassemble/reassemble side to keep the cost down.

this is a easy straight forward conversion,just take your time look at all the components and go for it! the biggest bitch will be having it leak tested and charged.

just take the doors off 

Ive already made me some door hinges for lifting off the doors, but still going to put the ac in kids dont need the wind  but i love it