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					Originally Posted by rickpark
					
				 
				If all R12 is gone, you need to find the leak or recharging is a waste of money. In which case you'll need a dye injector or use a can of R134 with dye. 
			
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 Don't do this.  If you do, and you want or need to get the system evacuated by a professional in the future, you'll incur him a hefty charge to get rid of the mixture in there.  Of course, he'll pass that charge along to you.