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#1 |
Registered User
Join Date: Sep 2005
Location: bedford Indiana
Posts: 70
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I need help, my expansion valve in the airconditioner is bad. My mechanic would like to know if there is a conversion kit out there to replace the expansion valve that works better, or should I just go and buy a new valve.
Thx, Mike |
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#2 |
Registered User
Join Date: Sep 2005
Location: bedford Indiana
Posts: 70
|
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I need help, my expansion valve in the airconditioner is bad. My mechanic would like to know if there is a conversion kit out there to replace the expansion valve that works better, or should I just go and buy a new valve.
Thx, Mike |
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#3 | |
Registered User
Join Date: Sep 2005
Location: bedford Indiana
Posts: 70
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Re: expansion valve in airconditioning
Quote:
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#4 |
Registered User
Join Date: Apr 2004
Location: arkieland
Posts: 1,070
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Re: expansion valve in airconditioning
you can convert it, but exp valve is easiest & cheapest fix & some a/c guys feel they are best,,brian
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#5 |
Registered User
Join Date: Apr 2006
Location: oklahoma
Posts: 10,670
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Re: expansion valve in airconditioning
Last I heard Chevy Duty ( or what ever they call themselves now) has a updated poa valve. Hope this helps.
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#6 |
Registered User
Join Date: Sep 2003
Location: Lee's Summit MO 64086 (Kansas City)
Posts: 128
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Re: expansion valve in airconditioning
I am going back with an original type expansion valve as we speak. Haven't seen any new designs. I did go with the updated POA valve.
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Thanks Don '57 Chevy Nomad '70 Buick GSX '72 Cheyene (Boys' truck) |
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#7 | |
Registered User
Join Date: Nov 2004
Location: "Under Montana skies."
Posts: 1,836
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Quote:
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'71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup. |
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#8 |
Registered User
Join Date: Jan 2006
Location: Houston
Posts: 434
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Re: expansion valve in airconditioning
I'd stick with the original expansion valve. If your original POA is working, why change it?
By the way, What is an updated POA valve? |
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#9 |
Registered User
Join Date: Apr 2006
Location: oklahoma
Posts: 10,670
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Re: expansion valve in airconditioning
If I remember right it cycles the a/c compressor clutch like newer vehicles.
Last edited by Aarons72s; 06-03-2006 at 11:12 AM. |
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#10 |
Senior Member
![]() Join Date: Aug 2005
Location: Los Angeles
Posts: 1,332
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Re: expansion valve in airconditioning
I think there's a little confusion here. These systems have 2 valves in them. First is the POA (Pilot Operated Absolute pressure) valve, which controls the pressure in the evaporator. It is a silver valve in the line from the evaporator to the compressor, and has 4 connections on it (in, out, a small oil bleed line, and small equalizer line to the expansion valve. The other valve is the expansion valve. It controls Freon flow into the evaporator. The expansion valve is mounted on the inlet to the evaporator. It is shaped like an inverted 'L', and is usually a cad-plated gold in color. The large line goes to the reciever/drier, it has the small equalizer line to the POA, and a small line that terminates in a sensor bulb under the insulation tape on the outlet line from the evaporator. Expansion valves are available from many suppliers, and usually run around $65 or so. Original type POA valves are no longer manufactured. New ones are out there if you look for them, but expect to pay $300. There is a 'POA Update' kit available. It eliminates the POA valve, and controls evaporator pressure by cycling the compressor off and on, like a modern system. It works, and it's a lot cheaper than buying an original POA valve. The problem is that the compressor clutch on these old system was not designed to cycle on and off like a modern system, and will wear out faster than it normally would. It doesn't seem to cause and abnormal wear to the A6 compressors, though. Since the compressor clutch is also available, and not terribly expensive, a lot of people with older G.M. A/C systems go this route.
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1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90. Last edited by Bob B.; 06-03-2006 at 03:59 PM. |
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#11 |
Lovin' Life in Miss.!
Join Date: Mar 2004
Location: Puckett, Mississippi
Posts: 1,937
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Re: expansion valve in airconditioning
Here is a link to BobbK's thread on A/C. There is a pic with a carquest part# for a late model orifice tube. This will get rid of your expansion valve. He did a lot of updates to his system so can't say if just switchin to an orifice tube will ba a good thing for ya. http://67-72chevytrucks.com/vboard/s...d.php?t=112463
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