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Originally Posted by OffroadX
You don't want to allow moisture in the system either, but the short time I had it open wouldn't have allowed enough in there.
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Don't matter if it's open a second or a day, air is in the system and because it's air (which is a non-condensable) the A/C system just don't like it.
Spent over 30 years in auto a/c service. The one thing I can tell you for sure is that when you have air in the system, it will do all kinds of wacky things that are very difficult to diagnose.
Most parts stores will loan the vacuum pumps (and some loan more) so you can do the job yourself. A/C is just like any other job. If you do it properly and follow the basic guidelines you will be ok. The manuals written were done so fo a reason!
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