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converting R12-R134A #1514420
10/09/13 11:06 AM
10/09/13 11:06 AM
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Home of the Bluegrass
MoparJunkie Offline OP
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MoparJunkie  Offline OP
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Is there anything I need to do to my factory compressor to convert my system?

Last edited by gg70rtUcode; 10/09/13 11:52 AM.

"It takes a Mopar to catch a Mopar”
1971 Roadrunner FJ6 Sassy Grass 505"RB, 18 spline 4 speed, and Dana 60 with 3.54
2022 Hellcat Charger Widebody Redeye Jailbreak: Hellraisin with 8 speed auto



Re: converting R12-R134A [Re: MoparJunkie] #1514421
10/09/13 01:41 PM
10/09/13 01:41 PM
Joined: Jan 2003
Posts: 28,063
Irving, TX
feets Offline
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feets  Offline
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Posts: 28,063
Irving, TX
I converted my 92 D250 to 134 by installing conversion fittings and recharging.

It's not a RV2 pump but that's the only one I've done.


We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon
Re: converting R12-R134A [Re: feets] #1514422
10/09/13 02:20 PM
10/09/13 02:20 PM
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Paul_Fancsali Offline
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Paul_Fancsali  Offline
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Vacuum system and replaced it with 134 it was still working after 6 years when car was stolen

Re: converting R12-R134A [Re: MoparJunkie] #1514423
10/09/13 03:32 PM
10/09/13 03:32 PM
Joined: Feb 2005
Posts: 174
Creedmoor, NC, USA
74Charger Offline
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74Charger  Offline
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Creedmoor, NC, USA
Published info states R-134A is not compatible with the mineral based lubrication oil in a R-12 system. R-134A requires PAG oil.

I tried the R-134a conversion in an R-12 sytstem and was not satisfied. You will lose cooling capacity in an older R-12 system. The condenser is under-sized for the higher discharge pressures. Expect loss of cooling capacity the hotter it gets outside.

My recommendation would be to find some old stock, R-12. If none available there is a new blend called R-401A or "hot shot" that i hear works well and it is compatible with all types of lubricating oil.

It is always a good idea to thoroughly flush entire system, remove and clean the TXV or metering device, and leak check thoroughly. You will not want any leaks if you buy some R-12. It is expensive!

Re: converting R12-R134A [Re: 74Charger] #1514424
10/09/13 07:29 PM
10/09/13 07:29 PM
Joined: Jan 2003
Posts: 28,063
Irving, TX
feets Offline
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feets  Offline
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Posts: 28,063
Irving, TX
Quote:

You will not want any leaks if you buy some R-12. It is expensive!




The Imperial took 84 ounces of R-12 but it runs at 38* front and 39* rear.

I hate the thought of ever having to open that system. Most of that R-12 was donated from Moparts and I've seen the pricing on Craigslist ads. It's not cheap.


We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon
Re: converting R12-R134A [Re: feets] #1514425
10/09/13 07:53 PM
10/09/13 07:53 PM
Joined: Jan 2004
Posts: 3,365
St.Louis,Mo.
70RR383 Offline
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70RR383  Offline
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St.Louis,Mo.
I sell cans on craigs for 25.Most people are repeat customers that throw one can in every summer.To them ,being cool is worth 25 or 50 every summer!!!

Re: converting R12-R134A [Re: 74Charger] #1514426
10/09/13 08:08 PM
10/09/13 08:08 PM
Joined: Mar 2011
Posts: 1,651
Cut and Shoot, TX
kentj340 Offline
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kentj340  Offline
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Cut and Shoot, TX
Quote:

It is expensive!




So expensive that if your R12 system is broke but not leaking, here's a way you can reclaim the old R12 for reuse:

1. Get an empty 20lb or so refrigerant tank from an A/C shop and pull a vacuum on it. Close the tank valve. An R134A tank will work fine for this with an R12 male/R134A female conversion fitting.
2. Connect a gauge manifold to your R12 filled A/C system, and purge the hoses of air just before connecting the supply hose to the closed tank valve. Put the tank sideways in an ice chest.
3. Put a block of dry ice on top of the tank, open the tank valve, and close the lid of the ice chest. The hose won't allow the lid to completely close, so seal the crack with masking tape and drape a blanket or towels on the ice chest for good measure.
4. Open up the A/C system to the cold tank, and the R12 will slowly migrate to the lower temperature.

Takes about 48 hours and two blocks of dry ice to get a below atmospheric pressure reading on the manifold, which means virtually all the R12 went to the tank. Here that's about $40 worth of dry ice.

But before starting, examine the conversion fitting. If it has a very small opening, drill it larger. Restrictions in this or in your hoses will slow things down a lot.

I've used this method several times on seized compressors and saved the R12 for another day.

Of course, if the compressor seized, your accumulator/drier will almost always be contaminated too. But if it is actually clean on the inside, you can bake it in an oven at a low temperature for a couple of hours to remove the moisture and reuse it.

One other thing. Install only highest quality OEM compressors. Parts store aftermarket units tend to self destruct and create deja vu all over again. DAMHIK.


If you don't see two dolphins, you need a vacation.
Re: converting R12-R134A [Re: kentj340] #1514427
10/10/13 09:00 AM
10/10/13 09:00 AM
Joined: Sep 2006
Posts: 1,126
Home of the Bluegrass
MoparJunkie Offline OP
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MoparJunkie  Offline OP
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Home of the Bluegrass
Is there a valve that I remove from the compressor?


"It takes a Mopar to catch a Mopar”
1971 Roadrunner FJ6 Sassy Grass 505"RB, 18 spline 4 speed, and Dana 60 with 3.54
2022 Hellcat Charger Widebody Redeye Jailbreak: Hellraisin with 8 speed auto



Re: converting R12-R134A [Re: MoparJunkie] #1514428
10/10/13 08:47 PM
10/10/13 08:47 PM
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert Offline
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Posts: 36,040
Lincoln Nebraska
I ain't done it yet but way back when I studied up on it iirc you need to change to "barrier" type hoses/replace the receiver drier/replace the valve at the firewall/change the oil (type) in the compressor. Vacuum the system of course & I had heard that it (134) will cool satisfactorily but I guess that is subjective. I have no doubt that a larger condensor (in front of rad) and or evaporator (in or under dash) will up it's efficiency


live every 24 hour block of time like it's your last day on earth
Re: converting R12-R134A [Re: RapidRobert] #1514429
10/10/13 09:01 PM
10/10/13 09:01 PM
Joined: Jan 2003
Posts: 1,643
A certified culture free zone.
74RALLYE Offline
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74RALLYE  Offline
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A certified culture free zone.
I recharged my 74 SE Charger with Hot Shot (414B refrigerant). It's the original AC system with the RV2 compressor and I didn't change anything else. It's been working fine for 9 years.

Re: converting R12-R134A [Re: 74RALLYE] #1514430
10/10/13 11:21 PM
10/10/13 11:21 PM
Joined: May 2008
Posts: 171
Las Vegas, NV
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chargerbr549 Offline
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Las Vegas, NV
Another way to reclaim the freon is to get an old compressor from a deep freeze or fridge and solder some ac fittings on the tubes and use it as a vacuum pump as well as using it to pump the freon out of the system and into the empty tank.

Last edited by chargerbr549; 10/10/13 11:22 PM.
Re: converting R12-R134A [Re: chargerbr549] #1514431
10/11/13 10:56 AM
10/11/13 10:56 AM
Joined: Jan 2003
Posts: 21,050
Niles , Ohio
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therocks Offline
oh wait.but hey.lets see.oh yeah.
therocks  Offline
oh wait.but hey.lets see.oh yeah.
T

Joined: Jan 2003
Posts: 21,050
Niles , Ohio
I did a bunch of conversions at work years ago.Just evac the system add a bit of oil and recharge.You do need the new valves as 134 and 12 have different ends.People here are cheap and telling them 600 or 700 dollars to change parts was a no no.Most systems worked great.You do have to use less 134.Its about 85 % of the 12 charge.Rocky


Chrysler Firepower






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