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#1
08-07-2011, 09:02 PM
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A/C r134a to r12 basics
Okay, I've been pouring through the archives pages and I've done quite a bit of reading from other online sources. What I need is a simple checklist/set of instructions on how to proceed.
My car was switched to r134a by a previous owner. It has always been a bit asthmatic in it's ability to cool. I have several pounds of R12 plus mineral oil to go into the system. I also scored an R12 recovery and recycling machine for $50 that came with a quarter full tank of R12. I also intend to remove the evaporator and clean the fins sometime in the near future when I replace my cracked dash. I just had the remaining R134a evacuated at a local shop yesterday. Last summer I know the system was full and operated well, yesterday the tech pulled out only .4 lb of r134a. I knew there was a leak, but I haven't used the A/C this summer and it produced cool air at the vents yesterday morning(I lost my thermometer otherwise I'd tell you how cold). So what's my checklist? Do I pull the compressor? New drier? What o-rings need to be replaced? And I know I need to pressure test the system, but is Nitrogen all I can use? Can I use another inert gas like Argon (which I have on hand)?
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Onus probandi incumbit ei qui dicit, non ei qui negat I recondition w123/w126/w124/w140/r107/r129/ steering boxes! 1984 300D "Elsa" odo reset 6/2011 147k 1983 300TD "Mitzi" ~268k OM603 powered 1995 E300 "Adelheid" 262k [Sold] 
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#2
08-07-2011, 10:09 PM
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yes. any dry gas can be used.
CO2, Argon, N2, etc even helium, but it's hard to get any volume of that to flush with. new compressor is best, along with new TXV and fresh lines. but flushing them is OK. did you read through my a/c recommendation sticky?
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!!  1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#3
08-08-2011, 01:11 PM
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If you follow VStech's advice, you will end up with a screaming a/c system. He's forgotten more about auto a/c systems that most of us know.
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1987 300DT 2002 Ford F-250 7.3 Crew Cab Short Bed
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#4
08-08-2011, 07:20 PM
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Quote:
Quote:
I've figured out how to get a new compressor, but as for the expansion valve and drier are these dealer only? Aftermarket? Part numbers? Where do you get the seals? Are there approved/non-approved sources? EDIT: I just found that I had a DIY for the expansion valve bookmarked in the wrong folder.
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Onus probandi incumbit ei qui dicit, non ei qui negat I recondition w123/w126/w124/w140/r107/r129/ steering boxes! 1984 300D "Elsa" odo reset 6/2011 147k 1983 300TD "Mitzi" ~268k OM603 powered 1995 E300 "Adelheid" 262k [Sold]
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#5
08-09-2011, 01:52 PM
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You should not have to go to the dealer for any a/c parts. Do a Google search & see what pops up. There are MANY suppliers for these parts, including the sponsors of this forum...
__________________
1987 300DT 2002 Ford F-250 7.3 Crew Cab Short Bed
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