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#1
02-14-2006, 07:52 PM
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A/C question on 126 chassis
Hi All,
Again, he posting is about my 1983 380SEC. I am wondering whether the A/C compressor can handle R134a? Is this just a swap fittings, make sure system is tight, replace drier, evacuate, fill with R134a conversion (obviously not in this order), or does the compressor/other parts have to be replaced as well? (I know on some BMWs, the compressor's seals cannot take the new oil associated with R134a - thus the quesion). Please help...
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1983 560SL Megasquirted (originally 380SL) My former Mercedes: 1985 300SD ~190k 1990 560SEL 2000 C220 CDI 1983 380SEC 102k dual-chain conversion 2000 C280 70k (sold) 1987 300DT (W124 - sold) 1972 220D (sold) 1971 220D (sold) Last edited by GregZ; 02-14-2006 at 09:59 PM. 
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#2
02-15-2006, 04:49 AM
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My understanding is that the seals would need replacing also - +/- other bits.
It's not as simple as replacing the fluid but I'm not sure exactly what is entailed.
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1988 W126 420 SE beware of fundamentalists!
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#3
02-15-2006, 08:39 AM
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MOST of the early R134a warnings WERE incorrect!
Conversion on any 1981 & later car with THAT A/C compressor is as simple as draining the old oil...flushing...adding new PAG 100 weight that is compatable with both R12 & R134a..pulling a vacuum & recharging with 70-75% of the original R12 spec. Remember that that system should have a new drier with a PRESSURE switch as part of that conversion..
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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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#4
02-15-2006, 11:27 AM
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will all drier's accept a pressure switch or is this a special drier with a pressure switch?
E.g., would something like this be okay: Thanks, Greg
__________________
1983 560SL Megasquirted (originally 380SL) My former Mercedes: 1985 300SD ~190k 1990 560SEL 2000 C220 CDI 1983 380SEC 102k dual-chain conversion 2000 C280 70k (sold) 1987 300DT (W124 - sold) 1972 220D (sold) 1971 220D (sold)
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#5
02-15-2006, 12:44 PM
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Greg, I would ask to see pictures of the other side. Not all R/D's will accept a switch. I would buy one from Fastlane, and pass on the $13 Ebay special!
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#6
02-15-2006, 12:57 PM
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Greg, although the compressor can "handle" 134a, it won't last as long and your hoses won't either. Especially as you are in Ft. Worth, a much better option will be to get a 609 cert online (costs about $15) and then get R12 and keep it that way. In the end, it will be cheaper for you and it will work better.
__________________
'82 300SD - 361K mi - "Blue" "Good judgement comes from experience. Experience comes from bad judgement." listen, look, .........and duck.
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