Variable A/C orifice tube?

[midniteplowboyy]

Which variable orifice tube should I use? The parts store has two versions listed. One is for temps up to 105ºF and the other is for 105ºF plus temps.

I live in Texas, we only get up to 105º ten days or so most years, but usually have sixty days thats around 100º. This years a little hotter than most though, 105-118ºF for the last two weeks.

How much more inefficient is the 105+ tube at cooler temps?

I'm changing to a sanden compressors in my 93 with the cummins swap and wanted to try out one of these variable orfice tubes.

Thanks,

 

[THEFERMANATOR]

Don't waste your money, just run a standard orifice tube. I've tried one in my BURB and ended up with hot air out the front vents, and i have tried them in others with the same results. A good acumulator and stock orifice works just fine.

 

[iamdave0887]

I believe there was a fixed orifice tube for "severe duty", more or less the desert. That might work for you.

 

[WarWagon]

The VOV doesn't work with rear air. They do improve the idle temps. You will want the 105+ tube. For the 1993 you are better off with the bigger R134A condenser if it hasn't been swapped out already.

The VOV made a big difference at idle on my 1995 Yukon w/ 6 blade fan. I have found that the Dmax fan also makes a improvement with AC.

 

[Burning oil]

I did the VOV on a 94 truck. Don't know that I can claim it was the VOV only, but that was by far the coldest GMT400 a/c I have ever been in. I also put the Larger Burban condenser in it and new Comp.

 

[THEFERMANATOR]

I know I put one in a 93 gasser a couple of weeks ago and it made the air hotter all around than it was with the fixed orifice in it. I'm running a SANDEN compressor now on my BURB and it works great with a fixed orifice. I do have dual air though. The SUBURBAN condensor is a worth while upgrade for a truck as it will make the air ALOT colder. Also the new style condenser's are more efficent and much smaller than the old header tank type.