Hi my name is Clint and I'm working to get the factory air working on my 1970 Chevrolet Nova. I am a mechanical engineer with a background on the theory of refrigeration cycles, but this is my first time diving into the practical implementation of automotive AC. I stumbled on this forum while resear...

I have nearly zero experience in this, but I'm interested to hear what you learn. I thought I had read that you need to upgrade the barrier hose on older cars to make sure R134a doesn't leak through. According to this article, freon may leak through that a sniffer and UV dye will not detect: https:/...

Thank you for the reply Gary! My thinking was that if the pressure at the POA service port was at 28psig the evaporator should have been around 32F and you should have had some cooling even if the POA valve was stuck. Maybe the reference pressure back to the TXV was out of whack. Whatever it was I'm...

What kind of flush are you using to clean out the system and the POA valve? I take it the POA must have been stuck in a partially open position as opposed to fully open since only a partial position would restrict flow out of the evaporator and lead to higher evap pressure / temps. When you were hav...