Quote:
Originally Posted by X5chemist
If it's discharged, go ahead and replace the valve cores. You can get the tool for $2 at Orielly's. Put a vacuum on it. Go 45 minutes minimum. Close the vacuum valves and leave vac hose connected. If it holds 26 Hg for more than 30 min, the leak was probably the valve cores. If it does not get below 24 Hg, a leak is somewhere. It's worth a try. I've save several systems by replacing the cores.
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Outstanding advice. I'll take it to my brother in law who has the tools and report back. I would be extremely surprised if it is the condenser.
And does anyone have any insight on leaving the system open for well over a year and what the ramifications of that may be? Drier goes bad? 
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