A few questions about a/c.Please bear with me. - Page 2 - MustangForums.com

Go Back   MustangForums.com > Ford Mustang Tech > 5.0L (1979-1995) Mustang
Sign in using an external account
Register Forgot Password?

5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
Sponsored by Weld Racing

Welcome to Mustang Forums!
Welcome to Mustang Forums.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

A few questions about a/c.Please bear with me.

Thread Tools Search this Thread
Old 05-17-2012, 09:23 PM   #11
2nd Gear Member
Join Date: Dec 2004
Vehicle: 1990 Ford Mustang GT
Location: New Orleans,La.
Posts: 198

First I am in shock that nobody in this forum knows anything on a/c second I figured out my wiring but I have a few other questions but if nobody will answer or if nobody knows then why bother?has anyone here purchased or installed the hose wizard r134 ac kit?lets start simple here
This ad is not displayed to registered or logged-in members.
Register your free account today and become a member on Mustang Forums!
ITALIANO66669 is offline   Reply With Quote
Old 09-03-2012, 09:58 PM   #12
Join Date: Aug 2012
Vehicle: 1993 mustang gt convertible
Location: mi
Posts: 8

Can anyone help me will a a/c compressor from 1991 mustang fit a 93 gt
glsron is offline   Reply With Quote
Old 09-03-2012, 11:25 PM   #13
Join Date: Jun 2005
Posts: 32

I did this on my '89 a few years back.

I had the compressor rebuilt with specific instructions to make it ready for r-134a. Stock o-rings are black and are for R-12, and so you have to replace all the o-rings everywhere for r-134a (they are either blue or teal in color). On my mod I bought a kit with several sized r-134a o-rings, and matched them up to the r-12 ones. Next you have to clear the system of the old oil. I used mineral spirits and forced air through every hose, especially the evaporator and the condenser. I have heard getting a larger tri-flow condenser works better for a retrofit. I then refilled it with PAG oil (around 6 ounces) which is supposed to help condition the system for r-134a.

Now the last part is the most important. Replace the dryer with one meant for r-134a, and with it make sure to get a matching A/C cycle switch. Using an r-12 switch is asking for trouble, as R-12 cycles at a lower psi.

Then replace the Schraeder valves with r-134a retrofit valves, draw a vacuum on the system, and then fill the system with r-134a. I stopped when the psi was between 35 and 40. Some other people say that 45 psi is nominal on a retro system. This worked for me. YMMV.

1989 Mustang GT (Daily driven, 310,000 miles, Bone stock)

89GreyStang is offline   Reply With Quote
Old 09-03-2012, 11:25 PM
Ford Mustang

Paid Advertisement


1990, 2005, 88, ac, charge, hose, in, kick, mustang, r12, seconds, takes, wiring, wizard

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 Off
Pingbacks are Off
Refbacks are Off

Forum Jump


Featured Sponsors
Vendor Directory
New Sponsors
All times are GMT -5. The time now is 08:14 PM.

© Internet Brands, Inc.

This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Ford® is a registered trademark of the Ford Motor Company
Emails Backup