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  #16  
Old 06-30-2012, 06:17 PM
eatont9999's Avatar
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Location: Dallas, TX
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Definitely go with the mineral oil. I had a fun time finding someone who had the correct mineral oil but I wound up with the same stuff you have there in the 32oz bottle. For leak testing, I would use propane because it is cheap and I have it ready. It's probably not dry and I don't know if a leak detector will sniff it but an ounce or so of R12 mixed in should do it. I'll probably catch hell for that suggestion but then again, some people run propane in their A/C systems and get good results. Guys, spare me the lecture, I know A-Z argument about propane but I am only suggesting he leak test with it given he has R12 which is the best option.

I just re-did my A/C in the 300SD and it is much better than it ever was with R134a. It's not blowing 40F at idle with 105F OAT but I would love to see an MB car that is. I also need to install a larger condenser fan which will help with idle vent temps. I'm not sure where in Dallas you are but if you need help, let me know.
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Last edited by eatont9999; 06-30-2012 at 07:04 PM.
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  #17  
Old 07-01-2012, 01:53 AM
'84 300D Owner
 
Join Date: Oct 2006
Location: Dallas, TX
Posts: 210
I've just realized that the PO did some modifications to the AC system. The high-side hoses where fitted with screw-on ferrules to attach the rubber hoses, instead of permanent crimped-style ferrules, similar to the attached pics. The hard lines are still intact, but the fittings were brazed on or fitted with adapters. It's kinda cool, cause now I can replace just the rubber portion of the high-side, not the whole thing.

Will an AC shop sell me just the rubber hose by the foot?

Are these screw-on hose ferrules better than the crimped style?

It would be great to have someone make the oil cooler lines this way, so all that needs to be changed is the rubber when it goes bad.
Attached Thumbnails
Going back to R12...-mdh_ac.jpg   Going back to R12...-mdn_aol_45_ac.jpg  
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  #18  
Old 07-01-2012, 12:22 PM
eatont9999's Avatar
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That certainly is unique. I have never seen such a thing on a car, especially for A/C lines. You may have to get the hose from a hose and pipe shop. There is a place in Lewisville off 121br called Stewart Hose and Pipe. I have been referred to them by several people for things like what you are asking. It looks like they carry a lot of heavy duty hose like on the A/C system.

Stuart | Hose & Pipe Company
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1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors.
2003 S430 - 107K
1983 300SD - Tanoshii - mostly restored ~400K+.
1983 300SD - Good interior. Engine finally tamed ~250K.
Monark Nozzle Install Video - http://tinyurl.com/ptd2tge
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  #19  
Old 07-02-2012, 09:09 AM
Posting since Jan 2000
 
Join Date: Sep 2011
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You have braided hoses? I haven't seen braided hoses on factory MB a/c systems since the 114/115 days. Those were reusable fittings. I can't remember the brand name for them. If you have these type fittings, when you get a leak at the fitting, you simply use wrenches to take it apart and then cut an inch or so off the line with a carbide wheel and thread it back together.

Stratoflex, that was the name of those fittings.

If you don't have Stratoflex, reusable fittings, then simply get new ferrules, a length of the correct size hose and crimp it in place on your existing fittings. The hose comes in numbered sizes and is quite readily available at auto a/c shops, or probably also at your local residential/commercial ac supply house.


WOOPS! After writing the above I saw that you already posted that you have Stratoflex fittings. Never mind!

And yes, these are better than the original crimp fittings. The car makers went to crimp fittings because they are cheaper.
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  #20  
Old 07-02-2012, 09:14 AM
Posting since Jan 2000
 
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Quote:
Originally Posted by cbjukraine View Post
I've just realized that the PO did some modifications to the AC system. The high-side hoses where fitted with screw-on ferrules to attach the rubber hoses, instead of permanent crimped-style ferrules, similar to the attached pics. The hard lines are still intact, but the fittings were brazed on or fitted with adapters. It's kinda cool, cause now I can replace just the rubber portion of the high-side, not the whole thing.

Will an AC shop sell me just the rubber hose by the foot?

Are these screw-on hose ferrules better than the crimped style?

It would be great to have someone make the oil cooler lines this way, so all that needs to be changed is the rubber when it goes bad.

No reason not to make oil lines with these fittings. Just go to your local hydraulic hose shop and they can sell you what you need.

That said, my experience has been that the oil cooler lines don't need replacing but maybe once in the life of the vehicle. Making these lines would make them easier to freshen up the NEXT time they need it, but that time will likely never come during your or the cars lifetime.
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  #21  
Old 07-02-2012, 11:19 PM
'84 300D Owner
 
Join Date: Oct 2006
Location: Dallas, TX
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Quote:
Originally Posted by Air&Road View Post
And yes, these are better than the original crimp fittings. The car makers went to crimp fittings because they are cheaper.
I went to McCains today to see about buying some new hose to replace the braided hoses on the high side. They said the stratoflex screw on crimps were utter crap. They are prone to leaking and crimped hoses were way better. They could be blowing smoke up my butt to sell me a job, but they showed me the goodyear barrier hose they use, and I can't imagine how it would work with the screw-on crimps. I wouldn't be able to attach it. Way too tight of a fit.

So I went to the junk yard and found a very good condition high side hose. I'm either going to use it as is or get McCains to fabricate hoses that I can disconnect at the compressor and at the oil pan, kind of like the one that runs from behind the alternator to the condenser.
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  #22  
Old 07-03-2012, 09:10 AM
Posting since Jan 2000
 
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Quote:
Originally Posted by cbjukraine View Post
I went to McCains today to see about buying some new hose to replace the braided hoses on the high side. They said the stratoflex screw on crimps were utter crap. They are prone to leaking and crimped hoses were way better. They could be blowing smoke up my butt to sell me a job, but they showed me the goodyear barrier hose they use, and I can't imagine how it would work with the screw-on crimps. I wouldn't be able to attach it. Way too tight of a fit.

So I went to the junk yard and found a very good condition high side hose. I'm either going to use it as is or get McCains to fabricate hoses that I can disconnect at the compressor and at the oil pan, kind of like the one that runs from behind the alternator to the condenser.

No, if McCain's tells you that, you can bank on it. They are good people. I haven't had Stratoflex lines since the 114/115 days. I liked them because when they DID leak, it was a quick and free fix. If Mark tells you they don't work well, then he has a reason and a good one.

Mark McCain will do good work for you whatever you decide to do.
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  #23  
Old 07-31-2012, 03:38 PM
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Quote:
Originally Posted by vstech View Post
I'd pump it up to 200psi for leak testing with pressure alone.

if you can source a sniffer, 4oz of R22 is legal for detecting a leak and venting.

what do you think of the digital gauges? I'm leaning towards the fieldtest set... more gadgets... $350 not bad when considering the goodies included.

Hey John,

I happen to run across this on the EPA website.

Quote:
The Clean Air Act does not allow any refrigerant to be vented into the atmosphere during installation, service, or retirement of equipment. Therefore, R-22 must be recovered and recycled (for reuse in the same system), reclaimed (reprocessed to the same purity standard as new R-22), or destroyed.
What You Should Know about Refrigerants When Purchasing or Repairing a Residential A/C System or Heat Pump | Ozone Layer Protection - Regulatory Programs | US EPA


"any" appears to be an absolute here. Just so that we all don't get in trouble for venting, do you have a copy of the reg about using it for testing?


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  #24  
Old 07-31-2012, 04:25 PM
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it falls under the hose venting allowances.
the passage you are quoting is to keep those who would dump a charge.

a proper recharge involves reclaiming the refrigerant from the system itself, and closing the valves between the reclaimer and the tank. then the hoses must be purged. and the hose contents are allowed to purge to the atmosphere. as long as the volume is not above 4oz. (I've got some hoses that are 50 feet long... I have to reclaim them...)
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"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!

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