I measured the weights of the cans during recharge so I believe it is correct. Also, the service manual indicates 30 psi is in the range considering the ambient temperature of around 95 degrees F. One odd thing I noticed is when I put the gauges on it again with the car off for 20 minutes or so, the...

My AC was cooling ok, but not great and then went to cooling not at all. I put on a set of gauges and it showed low charge. Added freon and back to cooling OK. Two days later, it was not working and the gauges showed low charge again. I replaced the evaporator, expansion valve, and filter-drier. I a...