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Davidf · 06-15-2015, 12:17 PM

Factory POA vs POA update (tube): Yesterday, I dumped (reclaimed) the R12 refrigerant and removed the Old Air Products POA update tube. I reinstalled the original POA valve that I calibrated to 29.5 psi. Evacuated, checked to ensure the system held vacuum (it did) and re-charged with R12. Man, what a difference. The original POA maintains very cold air out of the vents (did not measure actual temp, it was cold enough) at a constant temperature. The POS POA update tube would cycle the compressor excessively and the air would change from cold to warm constantly. Also, the off/on loading of the engine each time the compressor cycled was annoying. Further, I believe cycling the A6 compressor will severely reduce the life of the clutch/compressor.

So, moral of the story is to stay away from the POA update tube and install a genuine POA valve. I'm a believer.

06-15-2015, 12:17 PM	#64
Davidf Registered User Join Date: Nov 2014 Location: Austin Posts: 749	Re: Converting factory AC to use R134a Factory POA vs POA update (tube): Yesterday, I dumped (reclaimed) the R12 refrigerant and removed the Old Air Products POA update tube. I reinstalled the original POA valve that I calibrated to 29.5 psi. Evacuated, checked to ensure the system held vacuum (it did) and re-charged with R12. Man, what a difference. The original POA maintains very cold air out of the vents (did not measure actual temp, it was cold enough) at a constant temperature. The POS POA update tube would cycle the compressor excessively and the air would change from cold to warm constantly. Also, the off/on loading of the engine each time the compressor cycled was annoying. Further, I believe cycling the A6 compressor will severely reduce the life of the clutch/compressor. So, moral of the story is to stay away from the POA update tube and install a genuine POA valve. I'm a believer.