youll want to read the links, to understand the concepts and youll need a few specific tools but air conditioning is just not all that difficult, and be aware that theres several types of refrigerant. theres also several types of hose connectors so youll need to look into a few adapters if your working on several cars from widely separate years
http://www.aa1car.com/library/ac98.htm
http://www.youtube.com/watch?v=i9yv0euT ... re=related
http://www.youtube.com/watch?v=UW1GDiOa ... re=related
http://www.youtube.com/watch?v=w17DpGCc ... ure=fvwrel
http://www.wikihow.com/Fix-Your-Car%27s-Air-Conditioner
http://www.automedia.com/Air_Conditioni ... 020901ac/1
http://autoacsystems.com/
http://www.doityourself.com/stry/car-ai ... H9bNYZ28rg
http://www.doityourself.com/stry/how-to ... oner-freon
http://www.youtube.com/watch?v=UW1GDiOa ... re=related
http://www.youtube.com/watch?v=2wZb6HgI ... re=related
http://www.youtube.com/watch?v=2wZb6HgI ... re=related