FREE, download, Generic training material for beginners:

Automotive Air Conditioning Systems
http://www.familycar.com/ac1.htm

Aircondition.Com
http://aircondition.com/knowledge_base/Home.html

http://www.wisc-online.com/objects/ViewObject.aspx?ID=AMT1403
Automotive Air Conditioning: The Relationship Between Pressure and Temperature

automotive air conditioning diagram
http://www.google.com/search?q=automotive+air+conditioning+diagram&rls=com.microsoft:en-us&ie=UTF-8&oe=UTF-8&startIndex=&startPage=1&rlz=


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EPA R12 license online:

http://www.epatest.com/609/

http://www.acca.org/epa/

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Buy R12 online with a license:

http://www.google.com/search?hl=en&rls=com.microsoft%3Aen-us&q=r12+refrigerant&aq=2e&oq=r12&aqi=g-e4g6

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automotive air conditioner charging LINKS

Troubleshooting with Gauges

http://www.wikihow.com/Recharge-the-Air-Conditioner-in-a-Car

http://www.catalogs.com/info/automotive/how-to-charge-a-car-air-conditioner.html

http://www.aa1car.com/library/ac_recharging.htm

http://www.aircondition.com/

http://autorepair.about.com/od/regularmaintenance/ss/AC-recharge.htm

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automotive air conditioning tools and equipment
http://www.google.com/search?hl=en&rls=com.microsoft%3Aen-us&q=automotive+air+conditioning+tools+and+equipment&aq=1&aqi=g2&aql=&oq=automotive+air+conditioning +tools&gs_rfai=

automotive air conditioning TOOLS:
http://www.google.com/search?um=1&hl=en&rls=com.microsoft:en-us&q=automotive%20air%20conditioning%20TOOLS&ie=UTF-8&sa=N&tab=iw

automotive air conditioning TOOL kit
http://www.google.com/search?hl=en&rls=com.microsoft%3Aen-us&q=automotive+air+conditioning+TOOL+kit&btnG=Search&aq=f&aqi=&aql=&oq=&gs_rfai=

automotive air conditioning TOOL set
http://www.google.com/search?hl=en&rls=com.microsoft%3Aen-us&q=automotive+air+conditioning+TOOL+set&btnG=Search&aq=f&aqi=&aql=&oq=&gs_rfai=

R-12 and R-134A refrigerant temperature static pressure chart.

Great thread, I have a lot of reading to do. Thank you