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  #1  
Old 07-14-2011, 11:36 PM
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AC R134a recharge question for 16v

I have a 1986 Mercedes 190e 2.3-16v and the air conditioning has been converted over to R134a. I want to evacuate the system and replace a couple components and refill the system. Can any one tell me how much refrigerant to put back in to the system? I am looking for a number of pounds or grams of R134a to put back in the ac system. I was thinking it was about 2 pounds but I have forgotten.

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1990 190E 2.6 - Arctic white SOLD
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Old 07-15-2011, 09:03 AM
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This site says 30oz. for the old R12 system. Don't know if this changes significantly after you switch to R134.

http://www.idqusa.com/

Click on the button for finding the Low Side port and enter car info.
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  #3  
Old 07-15-2011, 09:06 AM
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LESS r134 is more

Add about 80% LESS r134 than the factory R12 specification.
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  #4  
Old 07-15-2011, 09:27 AM
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Figure about 70-75% of original fill, and that should have been 1Kg...2.2lbs
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  #5  
Old 07-16-2011, 09:14 PM
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Operating pressures for R-134a

Got the AC system evacuated and refilled with 75% of the 2.2lbs that was called for for R-12. I have cold air again, but not great. Anyone know what the operating and static pressures for the low and high sides should be with the R-134A in it?

Thanks for the help so far guys!
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1990 190E 2.6 - Arctic white SOLD
1986 190E-16v - Blauswartze
1993 300CE - SOLD
2003 W208 CLK 320 Cabriolet - Magma Red
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Old 07-16-2011, 09:29 PM
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If you're replacing parts it might be best to flush and refill with R12. The cost for R12 is coming more and more in line with R134a.

-J
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  #7  
Old 07-18-2011, 08:53 AM
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Most common issue on the W201 chassis is the fresh air door staying OPEN.
Needs to close to have COLD a/c.

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