Incomplete R134A conversion - What to do? - Off-Road Forums & Discussion Groups
Ford 67-96 F-Series, 78-96 Bronco All discussions of 67-96 F-Series Trucks and 78-96 Broncos

 
LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 08-23-2002, 03:58 PM
**DONOTDELETE**
Guest
 
Posts: n/a
Incomplete R134A conversion - What to do?

I bought my Bronco about a month ago and I'm just getting around to doing work on it. I discovered that the previous owner(s) put a R134A compressor on what appears to be a stock A/C system. What will happen is that the A/C blows cool for about 15-20 minutes and then starts warming up. I guess that there's probably a lot of head pressuring building up.

My question is:
Should I put an R12 compressor back on and cough up the money for the high dollar R12 charging or complete the conversion? Has anyone tried using an R12 substitute like R406-A(http://www.autofrost.com/) or even found a shop that handles substitutes?

If I went ahead with the conversion what are the minimum components that need to be replaced? I guess I would rather go this way but I've heard quite a few complaints about the performance of conversions.
Sponsored Links
Advertisement
 
post #2 of (permalink) Old 08-23-2002, 04:12 PM
**DONOTDELETE**
Guest
 
Posts: n/a
Re: Incomplete R134A conversion - What to do?

Here is what you need and how to do it. I did mine about a year ago it it runs great I live in Florida and it keeps my truck pretty cool with no tinted windows. I got all my parts at Discount Auto, you need to get a new dryer/accumaltor, orifice tube, all new o-rings, a cleaner for the system, some 134a a/c oil 2-3 ounces at most, about 4 or 5 can of 134a and one can of 134a oil charge. I found it eaiser to remove all of the a/c componets flush them with the cleaner, clean the fittings with some real fine steelwool. I took the compressor out and set it upside down for a day or so, so it could drain fully then I flushed it with the cleaner. I reassembled everything being sure to put a little a/c oil on all of the o-rings. After everything was back together I put a vaccum pump(got this from a rental store I had my own gauges if you don't check with the rental store be sure you tell them its for 134a) on the system to check for leaks then I let it stay on for about 4 hours to get all the moisture out of the system. After this you need to start the truck turn on the a/c and add 2 cans of 134a(don't worry about the knocking it will knock until you add the oil charge) after you add the 2 cans add the can of oil charge then top off the system by checking your gauges check with a local a/c shop for the right pressures on the day you do this because current temp has a lot to do with the pressures. Be sur you tell whoever you get the parts from that you are upgraded to 134a so you get the right parts. I left out so step by step directions to make this as brief as possible if you have any question feel free to ask. This was not that hard of a job and it saved me about 1,000.00 doing it myself. One place that I found leaks all the time is the tube that connects to the condensor it looks like the condensor is all one piece but, it is not there is about a 4 inch piece of tube that connects to the condensor with an o-ring I have had 4 Ford trucks that all have leaked here I guess nobody ever replaces this o-ring cause it is kinda hidden. Hope this helps and Good Luck,
post #3 of (permalink) Old 08-23-2002, 05:49 PM
Mud in my Veins
 
Steve83's Avatar
 
Join Date: Dec 2000
Location: Memphis, TN
Posts: 5,301
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: Incomplete R134A conversion - What to do?

Any compressor will work fine, and the stock system (with a different orifice tube) will work fine with R-134a - you're just low on refrigerant. Wal-Mart sells a hose that connects to the low side fitting to add some for less than $15, and they sell R-134a and oil charge also.

Pressure building up isn't why it's not working; it needs pressure to work. What's happening is that the small amount of refrigerant is getting compressed and then the clutch starts cycling because there isn't enough low-side pressure.
Steve83 is offline  
Sponsored Links
Advertisement
 
post #4 of (permalink) Old 08-23-2002, 06:33 PM
 
Join Date: May 2001
Posts: 398
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: Incomplete R134A conversion - What to do?

Get a set of gauges and see what your pressures are reading.I agree with steve,your suction pressure is probably low.If the clutch cycles on and off pretty quick that's a good sign.Still I would find a friend who can loan you some gauges or rent some.It will come with a charging attachment.

Billy
broncobilly69 is offline  
post #5 of (permalink) Old 08-23-2002, 09:59 PM
**DONOTDELETE**
Guest
 
Posts: n/a
Re: Incomplete R134A conversion - What to do?

Thanks guys....I'm off to fish in Montana for a week so I'll fix it up when I get back and report back on the results.

Thanks again!
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