The self-sealing can tap that you have and/or the can itself might be defective. Try a side can tap, available from this Forum's sponsor, that actually pierces the side of the can. The self-sealing cans are beginning to develop a reputation for being trouble-prone. I went out and got a new gauge se...

It sounds like your Manifold Gauge Set isn't "communicating" with the system and is reading only the pressure in one of the cans. So looking at the simple things first, are you sure that the service port adapter on the low side is fully open as you're attempting to charge the system? The ...

I am attempting to recharge my 2009 Mazda5. I have vacuumed the system for an hour and a half, let it sit under vacuum multiple days. It has held vacuum, and I am charging by weight with 12 ounce cans and a scale. I can get it to take about three ounces of refrigerant, and the low side goes up to ab...