A couple years ago the POA was not working correctly so I converted my 69 from R12 to R134 using a "POA eliminator tube" with pressure activated switch (a kit they sell at Classic Industries). I don't like the constant cycling on and off of the compressor. I'm not sure it was designed for that. Since then I found someone to rebuild the original POA and I'd like to put that back on. Does anyone know if the original-style system with the rebuilt POA will work with 134? Or do I need to go back to R12? Thanks!

Ken,
IMO have the POA valve rebuilt, flush the entire system of R134 and recharge with R12 and correct oil ( I would also replace the dryer). I know R12 is allot more expensive but you will be using R12 in the system that it was designed for instead of R134 in a system that it was not designed for.
The POA will work with R134 but you probably will still have the cycling problem unless you use an axillary fan on the condenser.

A stock POA will work fine with R134, mine produces 45 degree air on a mid 80 degree day. The POAs are adjustable (don't let anyone tell you they are not) a stock one is set to maintain about 34 psi. If your having the valve rebuilt have the rebuilder set it to 28 or 29 psi and you won't even notice a difference.

Im using my old POA with new R134, no problem.

Being in St Louis, you wont see much of a loss of efficiency between r-12 and 134. Now if it was vegas or phoenix...I would stay with R-12.

Thanks guys. POA was rebuilt with 134 in mind. I'll have to see if it can be reset again for R12 if the 134/POA setup doesn't work or causes problems.

If you've ever been in St. Louis in July when it's 95º+ with 75%+ humidity, then you know why I need to get this working...soon.

Thanks guys. POA was rebuilt with 134 in mind. I'll have to see if it can be reset again for R12 if the 134/POA setup doesn't work or causes problems.

If you've ever been in St. Louis in July when it's 95º+ with 75%+ humidity, then you know why I need to get this working...soon.

It will cool at RPMs higher than idle. At idle cooling will be so so. Adjusting the POA is correct but you really need a different condensor to make the thing cool like an ac should. If you don't mind a little discomfort at idle go with what everyone is saying. If you want comfort even at idle either go with R12 or buy the correct condensor. I think the outfit called Classic Auto Air has one that will drop right in using the same bracket bolt holes. It's pricey but they do work. I put one in my 71 pickup and it made all the difference in the world. I'm going with R12 in the camaro.

A couple years ago the POA was not working correctly so I converted my 69 from R12 to R134 using a "POA eliminator tube" with pressure activated switch (a kit they sell at Classic Industries). I don't like the constant cycling on and off of the compressor. I'm not sure it was designed for that. Since then I found someone to rebuild the original POA and I'd like to put that back on. Does anyone know if the original-style system with the rebuilt POA will work with 134? Or do I need to go back to R12? Thanks!

Yes the POA will work fine with R134a.

Also to Anyone who is using the clutch cycling switch witha POA eliminator valve, Lose thae switch and install an AC thermostat.
It will eliminate the constant cycling and allow the AC to get cold without freezing.

Kenfro, the POA can be reset for R12. Like everyone is saying, the POA will work with 134A. The problem is not just the POA. You need more cooling on your condensor for 134A than R12. If you go with R12, a stock condensor is fine. If you go with 134A and you don't mind your ac warming at idle, then the 134A is fine with the stock setup and a readjusted POA. I live in Houston along the Gulf Coast. Warming at idle is just not acceptable to me. And remember, when the ac is not cooling properly it's also not dehumidifying properly. What this means to me in the summer along the Gulf Coast sitting in traffic is sweating with the ac on. I changed the condensor to one of those axial flow jobbers and wa la, no more sweating at idle with 134A gas. It was amazing!

By the way, I guess if you figured out a way to spray cool water over the R12 condensor at idle when using 134A, it would cool just fine.