[77newell]

It is probable that both our perspectives are accurate, the difference is that rate of flow through the system. The higher the rate of flow the greater the pressure needed to drive the heat exchange between the refrigerant and the air. So, in my system that is presumably plugged and therefore has zero flow, or close to it, the pressure will be determined directly from ambient temperature. In a system at full flow, it will require a higher pressure to cause the refrigerant to condense in the limited time it has in the condenser. The sizing of the capillaries is set to produce this needed pressure with the flow needed to convey the heat from inside the coach to outside the coach.

I figured this all out in the middle of last night, I had nothing else to but sleep and this was bothering me. Given that my capillaries are probably 0.054" diameter (and there are two of them) I would expect to see a fairly fast bleed down of pressure when the compressor turns off. If that happens then I will add R22, if not we need to try clearing the capillaries. I'm reluctant to add R22 myself since I have no way of recovering it if that doesn't work and I will not just vent it to the atmosphere, ergo I need the tech help.