Automotive Air Conditioning Information Forum

History Detour

I have had my car for 20 years now. Back in 1998 when I first got it, the original engine and AC system were fully connected, although I don't know if the system was functional. Here is what things looked like way back then:

http://cjnn.xtremefabricator.com/images/psnpics/engine1 ...

Thank you bohica2xo! Can't tell you how much I appreciate the input.

Yes this was a long time in the planning. I bought the docs adapters when I first got the compressor because I was aware they were going out of business and they were liquidating supply. However at this point my timeline is within ...

Suction Hose

I have been sorting out fittings and hose ends to plumb the system. One place where a standard fitting poses a problem is at the exit of the POA valve. This joint is a #12 o-ring, however the standard size now used for the suction line to the compressor is #10. I needed a 180 degree ...

Be gentle with the schrader valve on the oil return line at the POA body.

I was thinking to just leave that valve in place. I worry about damaging it while trying to remove and reinstall. Is there any reason to remove it for flush or test? If not, I will leave it undisturbed.

The 26 psi ...

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 ...

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 ...