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A/c Compressor Installation

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Hello everyone, I'm looking for some input on how to best install an A/C compressor to my '94 SC400. I haven't done this before. The compressor I'm installing is OEM and was pulled out of a fully charged A/C system on a '97 SC400.

I'm replacing my compressor after some research into my blinking A/C light (as seen here).

I figured all I had to do was take out the junk compressor and put everything back together with new o-rings. But now I'm under the impression that the entire system needs to be pressurized with a vaccum and professional guages are needed to make sure everything is in order. It's also been suggested I get a $15 A/C Dryer from NAPA to replace the old one. Finally, I've been told that I can find potential leaks in other areas while I install the compressor using a blacklight. I think there's a big one somewhere since the junk compressor had refrigerant in it.

In any case, I'm debating on how best to go about things before I start installing the compressor. I've attached the pages I'm following in the SM to this post.

As always, thanks for your help in advance.

AC Compressor SC400.pdf

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