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

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.
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Old 05-17-2012, 09:23 PM   #11
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Join Date: Dec 2004
Location: New Orleans,La.
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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
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Old 09-03-2012, 09:58 PM   #12
Join Date: Aug 2012
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Can anyone help me will a a/c compressor from 1991 mustang fit a 93 gt
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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.

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