Proper charge for R134A
Lead Driver
Joined: Feb 2000
Posts: 5,374
Likes: 46
From: Palm Bay, Florida
Proper charge for R134A
I recently bought a "kit" from these Interdynamics people that everyone has heard of concerning Auto. A/C stuff.
This kit IS NOT the kit that is used for Retrofitting from R12 to R134A.
This kit included a can tap valve, a short charging hose, a guage that is not only numbered with psi, but also color coded, and last but not least a can of refridgerant 134A that has a small amount of oil,sealer, and dye.
My question is this: This guage indicates that from 25psi to 45psi is the "good" range, and one of my vehicles that I bought the kit for in the first place now that I have charged it reads at just barely 25psi, the air is cold, and the system seems to be operating OK, should I put in may be 1/2 more standard size can of R134A or leave it alone? I think the system has an incredibly slow leak somewhere, as it hasn't been touched in 5 years until now.
Also, I have a '94 F150 that I checked just for the heck of it, and it runs at about 44psi, it blows out VERY VERY Very cold air, so my thinking is to go ahead and bring the other vehicle (a '83 Lincoln Town Car)(that has been professionally retrofitted up to around the 44psi mark. Thanks!!
This kit IS NOT the kit that is used for Retrofitting from R12 to R134A.
This kit included a can tap valve, a short charging hose, a guage that is not only numbered with psi, but also color coded, and last but not least a can of refridgerant 134A that has a small amount of oil,sealer, and dye.
My question is this: This guage indicates that from 25psi to 45psi is the "good" range, and one of my vehicles that I bought the kit for in the first place now that I have charged it reads at just barely 25psi, the air is cold, and the system seems to be operating OK, should I put in may be 1/2 more standard size can of R134A or leave it alone? I think the system has an incredibly slow leak somewhere, as it hasn't been touched in 5 years until now.
Also, I have a '94 F150 that I checked just for the heck of it, and it runs at about 44psi, it blows out VERY VERY Very cold air, so my thinking is to go ahead and bring the other vehicle (a '83 Lincoln Town Car)(that has been professionally retrofitted up to around the 44psi mark. Thanks!!
Elder User
Joined: Dec 2000
Posts: 570
Likes: 1
From: Austin Texas (area)
Proper charge for R134A
According to my book, the 83 TC required 48oz of R12 and operated at 24-52psi LOW side pressure. When your system was retrofitted for R134, 38oz of R134 should have been installed (80% of the R12 charge). Although adding small amounts of R134 probably wouldn't hurt, remember the older system components weren't designed for the higher pressures required by R134, so I'd be real carefull and not overstress them. Put a thermometer in the AC airstream and see what the reading is. I redid my cars system (4years ago) for R134 and my air temps are 42-44dg in our hot Texas summers. If your temps are 42-48dg, I wouldn't mess with it. Rembember when reading that psi gage, the doors/windows must be shut, the ambient (outside air) temp must be at least 80F and the car up to normal operating temps. Hope some of this helps.
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