Quote:
You charge by a thermometer and pressures, that’s it.
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I would have to disagree. I charge by weight. I have added refrigerant to systems that are not completely empty by taking into consideration the pressures, ambient temperature and center vent temp. but I think charging by weight is preferable, since it's the only way to put in the exact amount of freon your system calls for.
Consider posting on board in link below, I’ve found it to be very helpful.
http://www.autoacforum.com/categories.cfm?catid=2