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POA Problem

avr3600 on Mon September 08, 2008 8:32 PM User is offline

Year: 1971
Make: Oldsmobile
Model: Cutlass Supreme
Engine Size: 455
Refrigerant Type: R12
Ambient Temp: 80
Pressure Low: 0
Pressure High: 0
Country of Origin: United States

Hi Guys

I read the great article on testing POA Valves and It is very helpful. I do however have a question Im working On a 1971 oldsmobile Cutlass Supreme It has a Fridgidare POA Valve. I ran the test and much to my surprise i got a pop sound, but only one time every time i put air to it, it just gurgles or makes a fog horn sound. If i tap the output with my hand then it goes away. Is This normal or should it pop everytime it is activated. Any help is very helpful. Thank You In Advance.

Dougflas on Tue September 09, 2008 5:09 AM User is offline

Does it regulate at 30 lbs?

avr3600 on Tue September 09, 2008 2:04 PM User is offline

When It is making the fog horn sound it does not but when i block off the otput with my hand for a second and let go, the noise goes away. Then it regulates to 30psi. I put in as you recomended 60-90psi but it only works if i momenteraly cap off the output after that it regulates.
Thank You

Dougflas on Tue September 09, 2008 4:56 PM User is offline

It may be sticking. May work itself out. Has it been uncharged for a period of time?

mk378 on Tue September 09, 2008 5:00 PM User is offline

The pressure at the valve should stay at 30 psi as long as the air supply pressure is higher than that. If stuck open, a lot of air will come out and the pressure will fall. If stuck closed the pressure will rise. Noise really isn't important.

avr3600 on Tue September 09, 2008 7:59 PM User is offline

It has not been charged for a fair length of time how long I am uncertain. The First time I did the test it popped and worked fine. Any test after that it acts weird, like I had mentioned. Sounds like maybe time for a rebuild. Is there any remedy for the sticking. When it was installed in the system it wouldn't take more than a can of refrig. and my pressures were at 40 low 50 high with no build on high side with AC on so I figured POA valve or compressor since those are the only two old parts. I suspect the POA valve since it is acting funny.

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