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#1
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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Christopher Henkel 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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#2
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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#4
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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MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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#5
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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Christopher Henkel 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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#6
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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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket  Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E.
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#7
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.
__________________
MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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