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  #1  
Old 10-03-2017, 09:45 PM
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Question about condenser replacement

I had to remove my a/c condenser to fix the accident damage on my w140. So I had to drain all the freon and oil. My question is when I get everything back together what is the procedure for recharging it? Do I need to add oil and freon, or do they come together in the can?

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Old 10-04-2017, 06:23 AM
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Add oil to the various parts as you are putting everything back together. Some goes in dryer, some in the condenser and most in the compressor (if it is a Sanden unit). After you button everything up run a vacuum for at least an hour and then charge with the correct amount of refrigerant.
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Old 10-04-2017, 01:04 PM
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Pressure test the system with nitrogen
Pulling a vacuum is not an adequate leak test
The system in my 124 wagon will hold 100psi all day
It will leak down from 150psi to 100psi in a couple of hours
30" of vacuum is equivalent to about -15psi
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Old 10-04-2017, 02:57 PM
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Ok just a heads up, I don't have a vacuum, just a diy guy here. I just want to put everything back together. I dont know about a little here a little there lol. I just know when I took it apart I took the line off at the condenser and let it leak out there, so I just want to make sure what came out is replaced. oil wise not freon. I know how to check that part with a guage.
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Old 10-04-2017, 03:26 PM
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Quote:
Originally Posted by hanly2 View Post
Ok just a heads up, I don't have a vacuum, just a diy guy here. I just want to put everything back together. I dont know about a little here a little there lol. I just know when I took it apart I took the line off at the condenser and let it leak out there, so I just want to make sure what came out is replaced. oil wise not freon. I know how to check that part with a guage.
If memory serves right, you add abt 1/2 oz of oil to the condenser and 1/4 oz to the dryer. And you need a vacuum pump to put the refrigerant back in. If you dont pull out the air from the system before adding the refrigerant, you will have a mix of air+R134a which has pretty useless refrigeration properties.
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Old 10-04-2017, 03:59 PM
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Great thanks. So the dryer is the cylinder on the fender? And it takes pag 46?
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Old 10-05-2017, 06:11 PM
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yes that cylinder is the dryer and you need to replace it when the system is opened up for service or repair. and yes it takes PAG46 oil.

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