Im new in the industry and new on this site.
I installed an evaporator coil in an upflow unit. After charging with a few pound of r22 and turned on the ac to start doing superheat and subcool reading to adjust the freon levels I noticed a hissing sound near the line drier I installed about 4 feet from the air handler. The unit was holding pressure when I tested when I pressure tested with nitrogen and I maintained pressure in the gauges so I am sure it is not a leak. I am wondering if I got too much solder in the line and that is causing an obstruction in my attempt to make sure I had good joints. Tell me what you think