I'm going to vacumn my a/c after doing retrofit.

It works "okay", but at idle, it's not that cool, and generally speaking I think I can improve performance.

When I first did this the tech trying to draw it down could not because of loose fitting I found later. That and the fact that I want to add a VOV, and there is a very small leak near the muffler fitting, makes me want to draw down and refill.

My question is, I can rent a vacumn pump for $25./day, but what fitting do I need? And how do I do this. Connect the pump and start the a/c?, do I jump the compressor to keep it running? How long is best?

I have a cheap vacumn gauge that came from autozone, for low side, can I just use this to see if it holds vacumn after draw down?

anyway, you can see I have a few questions. any help appreciated.

jc
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1985 740gle na, 1990 740gle 16 valve