Where is it located? Normally in the trucks w/o front/rear a/c its in the condenser, but I have heard they are in the line close to firewall on Subs with front/rear air. Anyone know for sure?Im wanting to replace it with a vov type.

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Where is it located? Normally in the trucks w/o front/rear a/c its in the condenser, but I have heard they are in the line close to firewall on Subs with front/rear air. Anyone know for sure?Im wanting to replace it with a vov type.
It"s located in the Y that is atatched to the passenger side inner fenderwell, but don"t waste your time as your A/C will SUCK afterwards if you put one in. I tried this and it made teh A/C work good at an idle, but it blew only mediocre at speed as the variable orifice will not function properly with the rear expansion valve, and they even tell you to not run them in a dual system with a rear expansion valve. I ended up putting an electric fan on my condenser to make teh A/C work good at an idle.
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Thanks for the heads up. Thats all I need to hear then. If you did"int like the results then I won"t waste the time repeting the same thing.Whats wierd though is the guy at the a/c shop said it would work better at idle and the same as before at speed and that the evap valve and vov would compliment each other.My a/c guy has been in the business over 35 years and is very knowlegable.My old 94 truck with single cab air and vov would freeze you out of there in July. It was so nice!
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They work great in a single app, or even with a rear orifice. Ading the electric fan to the condenser made more of a differrence than teh VOV did anyways, plus now it is COLD going down the road.
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I was going to add a fan also. Hooked to "run" power so there is no delay in a/c cooling at idle or in traffic on hot days.Since the engine oil cooler went away with the Isuzu swap (Isuzu is a water to oil cooler in the block) that gives me a perfect spot to add the fan. On the 454 gassers you could get a factory pusher fan its a bolt in deal. I ran two of them on a Cummins conversion.
There is a "severe duty" orifice tube available that we use in all our conversions. Any good a/c shop should know what I"m talking about. It is a variable orifice tube for low rpm/extremely hot climate situations. Expensive, but is the best I found.works in the vans w/rear air. Never tried in a suburban tho, so I can"t vouch for that.

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I just went with what I had. Picking up aux cooling fan today. It does not seem to blow as cold as before. Pressure on gauges never got to the readings I normally see. How many ounces or 134 does the dual air burb take? According to AZ its 63oz so thats what I put in. The high side only got to 170 and low stayed up around 70. Ya"ll think I need more 134?
What compressor are you using? SOunds to me from your pressure readings that it"s not moving the volume needed for a dual air unit. Either you have an orifice that is ruptured and bypassing, or the expansion valve for the rear is hung open. With the high side being low, and the low side being high is a dead indicator of this. And the charge is right around 4 pounds, so 63 ounces is fine.