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Compressor won't kick in. Can't even charge system w/o compressor engaged. Any advice?
You're going to have to get a vacuum pump and pull a vacuum on the system first.
I don't know why you need refrigerant. But I'm sure you do. If you cracked open that system and replaced a part. You've got to pull a vacuum on it first
You know the refrigerant goes in the low side right ?

If you don't want to pay a shop to have the work done. You can always buy your own vacuum pump. I think they probably have some cheap Chinese pumps around a hundred bucks.
But if you're going to buy a pump. It would be nice to have a good set of gauges. But that's your call.

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I think you can rent a vacuum pump from Oreilly's or Autozone. I saw a picture at one or the other last time I went into pick up a part.
 
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