Has anyone ever had an issue with "activating" the low pressure valve on their AC system? I connect the hose with the gauge to low pressure connection, but can't add fluid. The gauge on the hose does not register any pressure when I connect it and if I try to add fluid, it just seems to pressurize the hose. It was very difficult to connect the hose, but when I finally did, I couldn't charge the system. Any suggestions would be appreciated.
