On question though, on the Evacuate and Charging Procedure tip.
It says to hook up gauges, vacum, etc.. then "...Assuming the system is holding a vacuum after letting the moisture boil off repeat the evacuation procedure again. This process may need to be done a few times before all moisture has been removed and you see no degradation in vacuum after closing both dials for 5 to 10 minutes."
So, if you are holding at ~29.9hgs, meaning no big leaks, do you let air back into the system to 'repeat'? Or do I just run the vacum for another 30 minutes, even though it is already there at 29.9?
Thanks for the help..
No, do not let air back into the system for a "repeat". 30 minutes plus at 29" vacuum, after which the vacuum holds, should be sufficient. If you want to extra analytical, let it pull vacuum an hour.
Evacuating a second time, probably means to add a little refrigerant, then pull vacuum again. My GM shop manual recommends triple evacuation. I think that is unnecessary.
If the system had a lot of moisture, though, the remaining gas after a single evacuation could be mostly water vapor. If you do not have a real strong vacuum pump, that could be a significant amount of moisture. In that case a second evacuation would help to get rid of it.
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