I ran across a meat case today that i noticed the site glass would be full and no bubbles for a while and then liquid would disappear for 2 or 3 minutes and start back flowing. The owner said he has never had problems with it. The reciever liquid level is right at 80 percent full. So i dont think it is low on charge.. I have not put gauges on it, because he said he has never had a problem with it.
My question is this......What are some things that would cause the site glass to do that?
Will it harm the unit ? What do i look for to find out whats causing it and to fix it ?