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I like to rebuild my vir. Got some parts galvinized.
and a o ring set and desiccants bags.( Rebuild set)
I know I can buy a new one. Bud I like to rebuild stuff. Like to know how it works.
If there are settings you need to set ore pressures that need to be set
Can't find any thing about it. The surely must be some info about it.
Thanks ,
VB, Unless you're really concerned about originality or you're going in for judging, get the VIR eliminator kit. Easy install and your system will work much better. GM only used the VIR for a couple of years and finally realized what a POS it was, they dumped it too. I have upgraded several of my cars from that era that used to have the VIR. Somewhere here I have thread giving the step by step process. I'll see if I can find it. If your heart is set on rebuilding yours I don't think it's too difficult. If you already have the desiccant bags and O rings, you probably don't need much else. Good luck, Greg
IS a VIR the small valve on the pressure side going into the lower pipe of the evap coil??
or the large one on the discharge side up top??
I forget.....I did replace the small one long ago, and I remember adjusting a top internal pressure nut and something else to the large valve....been a while....
the VIR will perform better (lower temps) at a wider range of operating conditions (idle to cruise) then the fixed orifice
the fixed orifice was a reduction in build cost, and a compromise to the efficiency of the AC (my opinion)
the operating pressure for both when it comes to max pressure were both set to around 405 psi (either high pressure shut off or relief on compressor)
the operating conditions for both r12 & r134a are very close so the VIR will operate with a coil temp right at 30*, same setting for both
obviously the repair costs are higher for the VIR compared to the fixed orifice
Rebuilding a VIR can require some specialized tools, it may be best to get one rebuilt but I also like doing things myself as you do.
In 75 GM changed the VIR to the EEVIR which was to increase fuel millage, they are not interchangeable so make sure you get the correct rebuild kit. The changes were internal so the only way to tell them apart was the parts finish, the VIR was silver and the EEVIR was gold.
This table shows the operating parameters of the 1975 corvette with the VIR;
This is GM's procedure for checking the system, 2000 rpm's sitting still is the worst case scenario as far as operating conditions;
I’m thinking of installing a VIR Eliminator kit in my 77’. At the same time replace the R-4 Compressor. The question that I have will the original A/C hoses fit or will they have to be modified.
I'm in the process of doing the VIR Elimnation kit installation on my car... kit came with two of the hoses but the other OEM hose will have to be replaced
with a barrier hose compatible with the 134 refrigerant.
I just off the phone with Old Air Products and got some info on there VIR Eliminator kit. They told me that the Eliminator is bigger in diameter and won’t fit in the old bracket. That the original VIR sat in, have any of you ever ran into this problem. And how did you modify it..
08-07-2019, 05:17 PM
Any one rebuild there vir
