I have now ordered the replaceent compressor,,, the low energy, higher efficiency unit.  I am just assuming its already made for the r134.  Per  Michael Fortes fine write up, I also ordered the two big hoses, the dryer, the 90 degree connectors and the STV kit.

My question, after reading seveeral strings on this site regarding ac things,  Since the new compressor is a drop in replacemnet for the old compressor, and is supposed to be built for for r134, I started second guessing what i needed to do about the stv kit,  Now Michael got a rebuilt a6, so it was a r12, he had to change his out (stv), and the replacement i purchased is supposedly already built for r134, so do I need to do the stv change per directions supplied by Michael..

i dont want to fool with someting if i dont need to, but i have it coming anyway, it ws just second guessing after reading other articles that got me to overthinking,, 

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You will need the correct oil to add to your compressor for the 134r

Get a set of washers for the hoses

You need the STV valve for the 134r

A set of AC gauges will get you the correct pressure readings — using a Chart— for the temp and humidity conditions at the time you are charging your system will give you the correct numbers you want at that time


Ok.    If i am pulling all these hoses oof and replacing, does it still need to be drained of freon,  or shoukd that be done up front?


It should be done first  —-by law due to its effect on our air quality

SB removed and put into a correct container 

Called evacuating the freon required by the shops that do a lot of AC stuff

Your call as to what you do


Ok.   Didnt know the order of evac.  Thanks

A vacuum ( to perg the system )  goes on to the system for a while to test for air leaks before you install the freon after the repairs are installed


so i do need to get a small vaccum pump after all the parts are put back together?  i was wathcing a utube video by eric the car guy,, and he hooked one up, to test for overnight, but that is not the same as pulling out the old freon,, correct.??


Freon removal first 

vacuum done later



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