R-134A retrofit - Off-Road Forums & Discussion Groups
Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

 
LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 04-17-2002, 09:04 PM Thread Starter
Journeyman
 
Join Date: Jan 2002
Location: Harford County Maryland
Posts: 125
Thanks: 0
Thanked 0 Times in 0 Posts
 
R-134A retrofit

Has anyone had any success with the R-134A retrofit kits? What about the air compressor powered vaccum pumps that the discount tool places are advertising for way cheap (<$25.00)? While the rust holes in my CJ preclude any need for A/C My big 'ol Dodge Pickup gets mighty warm this time of year.
7T8CJ7 is offline  
Sponsored Links
Advertisement
 
post #2 of (permalink) Old 04-17-2002, 09:52 PM
Addict
 
Mike86CJ7's Avatar
 
Join Date: May 2001
Location: Long Island, NY
Posts: 490
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: R-134A retrofit

I had it done on my '89 Mercury that I used to have. I had a shop do it. They recovered any Freon that was left, changed all the seals in the system, pressure checked it and filled it with the gas. Total cost was $200.

It was the best 2 bills I ever spent. The AC blew ice cold, even on the hottest days.
Mike86CJ7 is offline  
post #3 of (permalink) Old 04-17-2002, 10:10 PM
Old Hand
 
gigolo's Avatar
 
Join Date: Feb 2001
Location: kansas city
Posts: 935
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: R-134A retrofit

I've done it to maybe 5 cars in the last 2 summers, and it's well worth the money. I have recovery equipment and a vacuum pump, and do some refrigeration work, so it only cost me the $30-40 for the 134a kit. My chevy pickup was one, and it leaks out one of the hoses, but it still only costs around $5-10 per year for the 134a to refill it. At that price every year, it's not even worth fixing the leak. Even if you have to pay for it to be done, $200 sounds like a fair price for all the work Mike mentioned being done.
gigolo is offline  
Sponsored Links
Advertisement
 
post #4 of (permalink) Old 04-17-2002, 10:18 PM
 
Join Date: Jun 2001
Posts: 1,628
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: R-134A retrofit

Those kits, if used the way they are marketed to be used (put it in and go) it's Bye Bye compressor in no time flat. 134a retrofits must be properly done to achieve good performance and insure that the system lasts.
I'm a certified tech and have done quite a few 134a retrofits. Here's a brief rundown of what you have to do to do it right:

You need to:
-First off, the refrigerent doens't just disapear. If it's low or empty, you have a leak that must be fixed.

-Pull the compressor and pour out as much oil as you can. Refill with the proper amount of POE oil (don't use PAG on a retrofit, it's incompatible with the residual mineral oil left in the system.

-Disconnect all the connections, and flush each component except the compressor with either mineral spirits or AC fushing solvent available at the parts store or a refrigeration supply house. The removes all the old mineral oil from the system. The retrofit will not work properly if the new oil/refrigerent is simply DO NOT flush the compressor.

-Pour proper amount of new oil in the suction port of the compressor and reinstall. One the hoses are connected, rotate the compressor by hand several times to make sure you don't have a cylinder full of oil when it starts up.

-Reassemble connections with new, 134a compatible, O-rings (either the green ones or blue ones - the green ones are better) If the system uses an orifice tube type metering device, replace it. It's probably partially clogged, and they're less than $3. If you have a TXV, it should be OK to reuse it.

-Replace the filter/dryer. THIS IS A MUST. Some of the materials used in older dryers for R-12 are not compatible with 134a and the synthetic oil it requires.

-Install service port adapters. Big one with Red cap on the high side, and little one with blue cap on the suction side.

-Vacuum down system for at least 30 minutes. The Air operated vacuum thingies really don't cut it. You need a real vacuum pump to insure the all the air/moisture is removed from the system.

-Put in one can of refrigerant and start the system with blower on high. Charge to aproximately 75% to 80% of the R12 capacity (if it took 50oz of R-12, use about 40oz of 134a). From here, you'll need to fine tune the system. You'll want to slowly add freon until compressor cycling slows and suction pressure is at 30-35 psi. This puts the evaporator temp just above the freezing point. High side my be as high as 350 psi in really hot weather, but try not to let it get much above that. If you have a site glass, you'll want to just barely clear it. There may be a few small bubbles present. Every system is just a little different. These guildlines should get you pretty close to the proper charge, but you'll have to "play with it" a little to get it perfect. Start with what I've said above, and then slowly adjust the charge while monitoring the vent temp until the coldest temp is achieved.

Make sure you use a proper guage set. You want come anywhere close to getting it right with that little "suicide hose" that comes with the kit.

-And above all else, Please be carefull. There have been people killed by attaching a refrigerent can to the high side. Liquid refrigerant can, and will give you frostbite, so be carefull when connecting/disconnecting service hoses.

Hope this helps you out man. If you have any more questions, please feel free to drop me an email.
dschwab9 is offline  
post #5 of (permalink) Old 04-17-2002, 11:56 PM
 
Join Date: Dec 1999
Posts: 5,140
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: R-134A retrofit

Its not hard or complicated.

I bought a $40 kit from Autozone, converted my old FORD truck, it took about 2 hours, cost $40 bucks, and blew ice cold for 2 and a half years until I sold it.

I did remove the compressor and dump the oil, I DID peressure check with compressed air and soap.

I didnt flush anytyhing ( other than letting gravity dump the compressor) I didnt vac pump anything.
I was probably lucky, but it worked for a long time, and it was cold, and it was cheap, and Ive talked to several other folks who did the same thing I did ( some even less) and it worked for them too!

try it yourself first, see if it wors or NOT.

this is all ONLY IF THERE IS NO R12 in there!
Mine was empty, nothing I had to jumper the compressor to take the new refrigerant ( it was a YORK)

ozarkjeep is offline  
post #6 of (permalink) Old 04-18-2002, 12:17 AM
 
Join Date: Jun 2001
Posts: 1,628
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: R-134A retrofit

<blockquote><font class="small">In reply to:</font><hr>

it was a YORK

<hr></blockquote>
Those things are darn near bullet proof. I retrofitted a '78 ford van last summer - about 200K miles with original york compressor. A/C had been dead a year or so. Pulled it to drain the oil, and it was bone dry, not a drop of oil. Expecting the worst, I filled it with oil and charged the system. That compressor still pumps like a top.
dschwab9 is offline  
post #7 of (permalink) Old 04-18-2002, 07:25 AM
**DONOTDELETE**
Guest
 
Posts: n/a
Re: R-134A retrofit

i had an old dodge about a year ago with unworking air. picked up a kit from autozone the 39.95 one. all i did was replaced the top fitting, pumped in the 134, ran it for acouple of minutes, bled the valve(all that came out was air). put in more 134. then rode around with the windows up. the kit i purchased had everything you need (134, fittings, oil,).
post #8 of (permalink) Old 04-18-2002, 11:44 AM Thread Starter
Journeyman
 
Join Date: Jan 2002
Location: Harford County Maryland
Posts: 125
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: R-134A retrofit

Thanks all, Im going to try it. What the he!! if it doesn't work I'm only out about $40.00. I just have to figure out the vacuum pump and guage thing. I have a serious aversion to paying anyone to do anything mechanical for me and I dont want to pony up the necessary cash to buy stuff I'll only use occasionally. Any suggestions??
7T8CJ7 is offline  
post #9 of (permalink) Old 04-18-2002, 03:14 PM
Can't Get Enough
 
jeeperjohn's Avatar
 
Join Date: Sep 1999
Location: The Plywood State.... Florida
Posts: 1,340
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: R-134A retrofit

Auto Zone has a tool rental program and may have a vacuun pump. You will have to pay a deposit, but it is refunded when you return the tool.
jeeperjohn is offline  
post #10 of (permalink) Old 04-19-2002, 12:18 AM
**DONOTDELETE**
Guest
 
Posts: n/a
Re: R-134A retrofit

Some interesting links, if anyone is interested
http://www.epa.gov/ozone/title6/609/wantknow.html
http://www.epa.gov/ozone/title6/snap/macssubs.html
http://www.epa.gov/ozone/title6/609/retrguid.html
<a target="_blank" href=http://www.epa.gov/ozone/title6/609/609.html#factsheets>http://www.epa.gov/ozone/title6/609/609.html#factsheets</a>
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Off-Road Forums & Discussion Groups forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome