Re: Vacation Car - 56 Patrician

Posted by CarFreak on 2021/8/9 15:47:13

HH56 wrote:

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?

Those are good questions. That is something I am going to have to ask. I was planning on going with an off the shelf expansion valve. But I may need to rethink that. I was not planning on using the old packard valve, I was hopping the only "packard part" I needed to use was the evaporator and just get modern equivalents for everything else. Do you have the source for your information so I can use that as a talking point when I bring it up to them?

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