POA Valve need to be switched ? - ClassicOldsmobile.com


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Old August 8th, 2017, 01:35 PM   #1
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POA Valve need to be switched ?

I am collecting info for a jump to install R134 in my recently acquired 1968 442. I noticed on OPGI, the parts store, they offer a POA valve upgrade for this conversion. In reading numerous forums, this switch has never been discussed. Do I need to switch out the POA valve, or will the old one assimilate okay to R 134 ?
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Old August 8th, 2017, 03:32 PM   #2
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The original one can be adjusted for R134A. There is a screw (or bolt?) inside the large opening that is turned to reduce the pressure and thereby reduce the temperature in the evaporator. There should be several posts about this that you can find by searching the forums.

edit:

I found it for you:

https://classicoldsmobile.com/forums...2-cutlass.html

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Old August 9th, 2017, 08:00 AM   #3
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Thank you very much for the help and the link.
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Old August 10th, 2017, 08:25 AM   #4
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The "upgrades" are cycling suction valves that replace the POA. It's not a "better" setup, just different. It's simpler and better than a broken POA, but a correctly adjusted and functioning stock system, especially with a parallel flow condenser, can work well.
The A6 was not designed to cycle on and off, so the cycling switches can be hard on them.
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Old August 10th, 2017, 08:33 AM   #5
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AC Retrofit

So you guys sound very knowledgable in this arena, what is the best long term solution for me? I currently have a stock system that is blowing hot air, but is still under pressure, and an A6 compressor.
Am I trying to fit a round peg thru a cooler square hole, or should I replace the entire system, and start fresh, even if the old system appears to be working..

TIA,

Doug
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Old August 10th, 2017, 09:42 AM   #6
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My recommendation is to ensure all the parts of your current system are functioning correctly, there are no leaks, then charge it with R12.
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Old August 10th, 2017, 10:22 AM   #7
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Whats your view on R-12a ?
Better off buying regular R-12 off eBay ?
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Old August 10th, 2017, 11:32 AM   #8
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Quote:
Originally Posted by oddball View Post
The "upgrades" are cycling suction valves that replace the POA. It's not a "better" setup, just different. It's simpler and better than a broken POA, but a correctly adjusted and functioning stock system, especially with a parallel flow condenser, can work well.
The A6 was not designed to cycle on and off, so the cycling switches can be hard on them.
This is true, however GM did use the A6 in cycling applications from the factory in the late 1970s. The problem is the rotating inertia of the A6 wreaks havoc with the clutch and belts when you cycle them a lot.

I spent a lot of time looking in to this for my 67 Delta. I ended up going with the Sanden conversion sold by Classic Auto Air and the POA valve eliminator kit. I was going to keep the POA valve, but the price and long turnaround time to rebuild and recalibrate made the choice for me. The Sanden compressor can be used either way. I did get a new expansion valve calibrated for 134. Classic Auto Air has developed a bracket kit for mounting the Sanden on an Olds motor.
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Old August 11th, 2017, 06:14 AM   #9
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I did get a new expansion valve calibrated for 134.

Err...... Is that a thing? I'm pretty confident there's no adjustment on the expansion valves or meaningful way to alter their functionality.


OP: "best" is subjective. Avoid R-12a "freeze 12" or any other mixed junk. They put some other gas, usually propane, into the mix that kinda-sorta works as a refrigerant. It's better than having air in there, but it doesn't work well. Gets you out of the parts store parking lot though.

If you can find R-12 or someone that has it, then that works well with all the original stuff.

If you retrofit to R-134a you have the usual retrofit problems (flushing, adjusting, potential condenser upgrade, etc).

Just depends on how much you want to spend and what you want to do with the car. Some folks stick with R-12. I went for the parallel flow condenser, adjusted POA and Pro6Ten.
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Old August 11th, 2017, 06:32 AM   #10
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Err...... Is that a thing? I'm pretty confident there's no adjustment on the expansion valves or meaningful way to alter their functionality.
OK, I'll rephrase that. I bought a new expansion valve, as the old one was pretty well crudded up.
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Old September 16th, 2017, 12:24 AM   #11
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I rebuild the poa valves all the time. If you need to have yours done, its typically a few days. I used to work at Classic Auto Air. Rebuilding poa valves was the first thing they trained me on
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