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Author Topic: A/C Retrofit question  (Read 1243 times)

Corey

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A/C Retrofit question
« on: April 14, 2008, 02:50:28 PM »

I have an R12 system that I am going to change to R134A the system holds 5 lbs of R12 what I need to know is how much ester oil I need to put in the system? The compressor is a RV2.
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Steve

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« Reply #1 on: April 14, 2008, 04:15:28 PM »

There's a whole deal on that
 
Check this out
 
http://www.teamchicago.com/imperial/imp-ac.htm
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Corey

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« Reply #2 on: April 14, 2008, 05:38:22 PM »

Ok Steve thanks for the link it gave me some good info but it didnt answer my question. It didnt say how much oil I needed.
 
 
btw and i know you are busy busy busy but im still waitin on carbs
 
 
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Steve

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« Reply #3 on: April 14, 2008, 05:54:04 PM »

Yeah I know on the carbs. . .they're on the bottom of the list right now
If I read this right, 6 Ounces.  But that's for R12.  I somehow think it's supposed to get more for 134
My 72 FSM says 3.6 pounds of R12
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Corey

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« Reply #4 on: April 14, 2008, 06:06:27 PM »

I'll do some checkin round here and see what i can come up wit
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Brian

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« Reply #5 on: April 14, 2008, 08:39:08 PM »

I recharged the stock R12 A/C system in my 70 sport fury when I had it.  But I went the el cheap'o route.  I used a product called Freeze 12.  You can get a complete Kit of e-bay to recharge your existing system.  From what I could gather Freeze 12 is about 80% R134 with the other 20% being propane or butane or some gas like that.  Due to it's mixed state it can be sold and installed without any liscences.
 
The kits come with 3 cans of Freeze 12, 1 can of ester oil, 1 can of leak stop and all the fittings and hoses to charge it yourself.  You just install the fittings on your RV2 compressor and then turn on your A/C system to MAX A/C and then jump your pressure switch on the drier so the compressor is running.  The charge the system through your suction side of the compressor.  You will only need about 55-60% of the original R12 charge.
 
My A/C system worked GREAT!!!  Damn near froze up the dash it worked so well...  I used it for 3 years that way and never had a problem. 
 
I have since converted the R12 system in my 87 dodge ram to Freeze 12 as well.
 
 
 
 
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Stan Paralikis

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« Reply #6 on: April 17, 2008, 06:44:32 AM »

VERY timely.  I'm going through the hassles of converting the NYB as we speak and I've been running into a lot of dead ends.
 
I went to the first link and this was mentioned:
 
" Change the A/C system pressure & timing settings to accommodate the new R134a gas " 
 
Now, what little I know about A/C, that part REALLY confuses me.  Is there any more info concerning that anywhere?
 
Commando12008-04-17 11:50:44

Steve

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« Reply #7 on: April 17, 2008, 07:50:40 AM »

The system pressure is done by the relief valve in the compressor.  I am also told you need to install a R134 compliant expansion valve.
 
The timing I have no clue.
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Eric Barnhart

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A/C Retrofit question
« Reply #8 on: April 17, 2008, 08:32:03 AM »

I've retrod a lot of cars and never had to change the expansion valve,I put 4 or 5 oz.oil in and charge it-no problems so far. Hope this helps.
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Steve

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« Reply #9 on: April 17, 2008, 10:28:17 AM »

Me too Eric.  I was just repeating what I was told. . .
 
There seems to be allot of opinions on this subject on the net. . .but nobody is clear.  I am not sure what the difference is in the valves. . .Maybe just the O-Ring.  Who knows.  It's probably just another way of getting more money for a lable change.
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Eric Barnhart

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A/C Retrofit question
« Reply #10 on: April 17, 2008, 12:21:07 PM »

If you remember when 134 first came on the market they claimed you had to change every rubber part in the system to retro. At the time I had a old farm truck,81 chevy. I got the fittings put em on charged it with 134,worked fine. I didn't even add oil,just wanted to see what would happen,so to sum this up I think they were wrong,you are right -just a way to get more money!
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Stan Paralikis

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« Reply #11 on: April 18, 2008, 01:14:16 PM »

Quote from: thrashingcows
I recharged the stock R12 A/C system in my 70 sport fury when I had it.  But I went the el cheap'o route.  I used a product called Freeze 12....
WELL! Guess what I found at Wallyworld today.
Walmart sells an R12 replacement system using 134A just like Feeze 12. The system they sell is made by EZ Chill.
 
The more I read, the more I'm convinced the costly conversions are a  crock of $#!&.

Corey

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« Reply #12 on: April 18, 2008, 06:31:42 PM »

Ok y'all as far as the changing parts thing goes if the system doesn't leak then the only thing that needs to be changed is the receiver/dryer I got that info from my shop foreman its just his books dont go back far enough to tell me how much oil i need in my system. I am trying to find this out before I tighten all my fittings cuz he told me to put a bit of oil in the condenser, a bit in the dryer, a bit in the compressor. basically spread the oil out through the system since it was apart that way it isnt collecting in one place. 
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