Classic Auto Air Install Experience

Okay. I think I was confusing it with the POA valve used on my 71 Vette. I think it's some variety of EPR valve on the Vette because my understanding was that it essentially bypassed refrigerant around the evaporator based on the temp, so if the evaporator was cold enough, it would limit the flow through it and I thought flow around it, but I could be wrong.

There is a thermostat switch on the CAA system. I actually heard it cycling the other day when I had the system on while idling and it was fairly cool out still, so I think I should be covered there.

I converted my Vette over to R134 and was looking for the orifice tube since people always talk about changing that when you convert, but never saw any mention of it in the parts breakdowns. That's where I learned about the POA setup. What also struck me as odd is that people convert away from the POA to an orifice tube setup, which is sort of an "inferior" design from an efficiency standpoint, though simpler in operation. You can apparently adjust the POA valve to run with R134 better, but I can't break the connections on my car to get to it and it's not worth potentially breaking it for me to get a little better performance from it.