Re: Vacation Car - 56 Patrician

Posted by HH56 on 2021/8/9 15:40:39
I am going with the original air group to rebuild the evaporator. They said they could not only repair it, but also change out the flare type connections to O-ring style connections in preparation for R134a. I have a work order made and they told me it should take about 2-3 weeks to complete the work. Which would be nice if it all fits in the original Evap box without modification to that or the firewall openings. So we will see what happens.

Are they going to spec or supply a new pressure drop sensing evaporator valve compatible with the large evaporator with the change in fittings or is that type of valve still needed with the R134a or actually, I wonder if it was ever really needed. I had read in an old AC book the reason Packard and other mfgs with large evaporators used that type valve was because the pressure drop was so great a regular valve had erratic operation and periodic flooding of refrigerant so engineers felt extra sensing was needed. Maybe modern valves are much better. Are you going with an electrical thermostat and cycling clutch for the temp control or is the modulator fixed temp valve Packard used still in the picture?

This Post was from: