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11-21-2012, 09:37 PM | #1 |
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Join Date: Jun 2010
Location: Muldrow Oklahoma
Posts: 15
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A/C question
I am starting on a new project truck and have a couple things still up in the air. I am using an air cab 72 that has had the a/c evaporator open for a LONG time. Whats everyones opinion of the POA valve?? I have no expeiernce with them and dont know how they operate? I see in searching here the Oldairproducts.com has POA conversions, but they also offer a new evaporator that accepts an orifice tube?? Since I'm building a system from scratch only starting with the original evaporator( assuming it pressure checks ok) What parts should I use? BTW, work in auto/heavy truck parts, so sourcing pieces isnt a problem. Just not sure what parts will work the best together!
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01-02-2013, 07:27 PM | #2 |
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Join Date: Jun 2010
Location: Muldrow Oklahoma
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Re: A/C question
Still looking for some advice on this. Anyone have anything to say??
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01-02-2013, 07:33 PM | #3 |
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Join Date: May 2007
Location: Southern Cal
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Re: A/C question
If you are starting from scratch, I would go with a complete kit from vintage air.
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1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man |
01-02-2013, 08:44 PM | #4 |
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Join Date: Jun 2006
Location: Indiana
Posts: 4,859
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Re: A/C question
Without a doubt, I would change over to a orifice tube/ accumulator and cycle the clutch. Tune the low pressure cut out switch to about 20 psi and you will freeze ice cream. If I recall, Old Air can set you up with all the replacement parts to make a completely new system.
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'70 GMC C1500 LWB Power disc brakes. WooHoo! Posi 6 Lug Dana 60 |
01-02-2013, 08:53 PM | #5 |
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Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,943
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Re: A/C question
I used Chevy junkyard parts out of a later 90's truck inside the 71 Chevy factory boxes. I have the 134A Freon and with the cowl vent mod my AC blows 38 degree's all the time now. The orfice is the best way to do it.
After the junkyard parts I did buy new condensor and compressor for 134A though. The factory stuff just didn't hold up. The old A-6 compressor want last long cycling are at least mine didn't and I bought a new one for it. I hooked the electric fan to come on when the ac switch is activated by way of a 30amp relay.
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
01-03-2013, 08:54 AM | #6 | |
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Join Date: Feb 2000
Location: Center City, MN, USA
Posts: 3,254
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Re: A/C question
Quote:
A6 compressors are not designed to cycle on and off. If you run one (stock compressor), don't run a cycling AC system. You can adjust the POA to work with R134a or leave it and run R12. The link I used to adjust it is broke. Perhaps you could search around on ackit's website to see if it has just been moved or something. I did a write up here a while ago: http://67-72chevytrucks.com/vboard/s...d.php?t=478564
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'70 cab, '71 chassis, 383, TH350, NP205. '71 Malibu convertible '72 Malibu hard top Center City, MN |
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