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#1
07-25-2009, 02:02 PM
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Recharge AC Procedure
Recently purchased a 300SL that sat for a few years. Ac worked fine but litlle by little it is blowing warm air and compressor not engaging which I believe is low freon. It is an R12 system and I have some R12the old owner gave me. How do I recharge the system. I have bought the hose and fittings. Lust looking for the procedure.
Sweating like hell in Florida Thanks
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Moohampshire 1988 300E 124K 1994 Volvo 850 Turbo 115K Killed by a Cement Truck 1992 300 CE 95 K 1986 300 SL Euro 96K 
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#2
07-25-2009, 11:41 PM
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reply
First loc the main line at the front of the (right) and un cap the cap- start the engine-turn on the ac and then connect your connector and fill- hopefully the system will hold it..you can feel the cold ac when you check while running....
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 Timothy Evans TimEvans35@gmail.com CELL 310 990 6780 1985 380 SL  2010 CL 6.3 AMG  *2009 CL 550 Sport 4matic  New addition-1984 380 SE  Newest Edition 1986 300E AMG 
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#3
07-26-2009, 12:19 AM
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Well wait a second! if it's slowly getting warmer , then you may have a leak. I would suggest that you put some gauges on it and test the system. High side should be around 250 and low side should be around 40.
If the system is empty, perform a vac and check if the system holds a vac for at least 30 minutes. If it does, the go ahead and charge the system.
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With best regards Al
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#4
07-26-2009, 12:55 AM
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we hope there are no leaks- that is the cheap way out- but what can you do-
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Timothy Evans TimEvans35@gmail.com CELL 310 990 6780 1985 380 SL 2010 CL 6.3 AMG *2009 CL 550 Sport 4matic New addition-1984 380 SE Newest Edition 1986 300E AMG
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#5
07-27-2009, 12:12 PM
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Suggest borrowing a AC system vacuum pump and doing a thorough system evacuation to establish the system is tight and free of air/moisture. If it holds vacuum...29.9" for at least an hour, you should partially charge half a 12oz. can into the system and then use a sniffer to check for leaks not revealed by the vacuum test. If the system passes this test you should be able to recharge the system with the rest of the freon (1kg total charge weight) and be good to go. Don't forget to replenish the compressor oil as well. Much of it will have leaked out along with the freon.
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