warmer air AFTER recharging AC

was the compressor running when you put the can in?

As I recall it must be running to charge.

My daughter has a 96 Jeep Grand Cherokee after about a year it leaks enough to only blow cool air. add 1 can and the pressure is right where it should be and the air is cold ~45-50 deg at one of the vents.

My 2006 Grand Caravan seemed like it needed some refrigerant and I hooked up a can and the pressure was on the low side. I added refrigerant but the pressure never changed. I thought it was odd so I checked the outlet temperature and it was in the mid to high 30's, OOPS that might have been too much refrigerant. I bled a bit of refrigerant off and got the outlet temp to be in the low to mid 40's. checking the pressure again still showed it to be on the low side. not sure why it read that way or what I might have been doing wrong.

My point of all this is (and someone correct me if I'm wrong) overcharging the system can bring the evap coil temp so low that it can ice up and block airflow, so the result is no cooling. (think old freezer that had to be defrosted every month or so)

Just my semi uneducated 2 cents