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Re: Factory A/C: POA Valve or Cycling switch?
Quote:
Originally Posted by lsversaw
What does POA stand for?
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Pilot Operated Absolute pressure valve. It's job is to maintain a certain pressure in the evaporator by regulating the suction of the compressor. It works in conjunction with the expansion valve, which controls liquid refrigerant flow into the evaporator. A cycling system does the same thing by turning the compressor on and off by use of a low pressure switch on the line coming out of the evaporator.
Conversion to a cycling system will work, but I don't think it's an ideal solution. This is particularly true if you are still using the original A6 style compressor, they were not designed to cycle (though GM did use them in some of the early cycling systems).
I stayed with the POA on my own truck (had it recalibrated for R134A) and a buddy did same on a '72 El Camino. Both systems work great.
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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.
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