Quote:
Originally Posted by EclipseGST
Remember you cant just add xxxx amount of freon to an empty system. You need to pull a vacuum on the system for at least a half hour to make sure all the moisture and air is out. It is good to replace the drier if you are re-doing your a/c system as well and to make sure the correct amount of pag oil is in the compressor.
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perfectly said, just to add though.. make sure you compensate for the change of fluids in your system. R134A doesnt expand the same as R12. so you need to use 20% less then what your system would require for R12.