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134a Conversion in 87 audi

AudiSpaulding on Thu October 23, 2008 10:39 AM User is offlineView users profile

Year: 1987
Make: Audi
Model: 5000
Engine Size: 2.2
Refrigerant Type: R-12

Hey guys, I was recommended here by a couple of my Audi buddies to get some definitive info on converting my AC over. My dad had his own business for 30 years and probably had every possible cert you could get. Did everything the old fashioned way with thermometers, feel, and a set of manifold gauges. He does have some R12 but I don't want to go through him to get this fixed.

When I first got the car the AC was clearly low on freon but it still blew cold. The car ended up sitting for a while w/o the AC being touched so it ended up bleeding down to the point the low pressure switch won't let the compressor engage. I've decided to do the 134a conversion and would like some opinions/advice.

I'm picking up a new reciever/drier, this conversion kit, a variable orifice

I'm also going to flush out everything that I can as best as I can. I've been told these lines are sealed from the factory so there shouldn't be a problem with the 134a leaking through them, and this is supported by others that have done the conversion..

The system from what I've been told holds about 39oz of R-12, and I can go to about 85% of that w/ 134, so I figure about 33oz should be fine.

What kind of oil should I use for this? I've been told by a few people to stay away from ester because it can cause premature compressor wear, and I should try to find some ROK oil. but to be honest with you, i've never heard of ROK. I was considering getting some of that polymax2 oil, but i'm not sure anymore

How much oil should I put in, and where?

I know i've gotta change the o-rings, the accumulator, the fittings, flush everything, drain the oil from the compressor, have it evacuated for a while, then charge it up. Short of that I really have no idea....



Edited: Thu October 23, 2008 at 5:18 PM by Automotive Air Conditioning Information Moderator

TRB on Thu October 23, 2008 5:23 PM User is offlineView users profile

Sounds like you are looking for the different site which promotes the VOV and Roc oil. Neither items I would suggest using in a auto a/c system. Also I deleted one link in your post as that website blocks all links to our site. So I feel its fair game to not allow their junk on my site.

Best of luck on your project.


When considering your next auto A/C purchase, please consider the site that supports you:

iceman2555 on Thu October 23, 2008 11:40 PM User is offlineView users profile

Since 12 is available...a suggestion would be to stay with 12 for this vehicle.....have a feeling that disappointment is ahead with this retro. Just my $.02 worth....
If deciding to go for it...PAG (double end capped) or POE (ester), BVA makes a great one....and has the best PAGs on the market.....ROC....tried that stuff many years ago....tested on some test stands and on cars....never found a need for the product....did nothing special....and of course, like much of the hype from the marketing it was stated...found nothing special about this stuff.
Sorta like having a VW and saying that it runs better on 'race fuel'......stay with the PAGs or Esters.
Keep in mind that when retro fitting 134a into this vehicle....normal r12 pressures become may experience some higher high side pressures....(reduces system performance)...but do not take refrigerant out...this may result in an undercharged system...and will get the opportunity to install a new compressor.....ahhh.....get to spend some more money....remember 12 works best in a 12 car......
That being said....good luck....

The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government.
Thomas Jefferson

HECAT on Fri October 24, 2008 6:23 AM User is offline

Keep it R-12. Whats wrong with letting Dad help out?

I am glad you came here for advice as it looks as though you are being sold some junk marketing stories.

Search the "Auto A/C Procedure" page for proper conversion information.

Remember that the proponents of alternative oils (PAO), lubricant enhancers (Polymax), conversion kits (aka death kits), VOV's, sealers, and many other magic solutions; many times have the alternative motive to dazzle you with fear stories and superior words into buying and using inferior products.


HECAT: You support the Forum when you consider for your a/c parts.


Rick-l on Tue November 11, 2008 12:21 PM User is offline

Have you looked at this?

service bulletin 95-03

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