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I got a vacuum pump and manifold gauge set from harbor freight.
I purchased 6 cans of Freeze 12 from carquest (14bucks a can)
I vacuumed down my system (late at night when the air was cool and humidity was low).
System held vacuum for 1 hour. (closed off the valve to see if it would lose vacuum)
Since this was a sign that I did not have leaks, I added 2.5 cans of Freeze 12.
After that (rear ac was cold but front was not) I replaced several vacuum lines that closed my Heater control valve.
My AC is now cold.
My cost for the tools from harbor freight was 60 bucks. Manifold gauges required some generic orings so the refrigerant would not leak.
ALl in all I suggest if you can get the 10 dollar air compressor actuated vacuum pump and test your system before you decide to convert. I think if you convert and do not replace all the parts the AC will not work and your compressor if the wrong oil is used will lock up .
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