Cool Aire System in my '69

[uskatebetter]

ok so my '69 has the cool aire system and the man i bought it from told me that it was originally a non-a/c car but with the weather being like it is here in houston he had an a/c installed so i would like to get it working again but i dont even know whats wrong with it besides that it fell off hahah so could you guys tell me some common problems and the soultions to them, and i'll see if thats whats wrong with it.

thanks

also, any tips on keeping it or any little info you guys  have about it would be great
thanks again.

heres a pic to geta feel for what im workin with