My best theory would be as follows: Air is a non-condensable, meaning it will not condense to a liquid in the condenser. As the refrigerant passes through the condenser, it picks up small amounts of the air and circulates it throughout the system. As the air/refrigerant mixture passes the point of the access fitting, you read the compressed air pressure and the liquid refrigerant pressure separately, causing it to flutter between the two. Does this make sense? As I stated, this is my best theory. I have no proof of this.
Wisdom has been chasing you, but you have always been faster.
In your darkest hour, when the demons come, call on me brother and we shall fight them together.
A Veteran is a person, who at some point in their life, wrote a blank check payable to the United States of America for payment up to and including their life.
Gene Castagnetti-Director of the National Memorial Cemetery of the Pacific in Hawaii