The air Conditioner on My 2014 F150 started blowing out 60F air during the hot spell we had recently ( in the 90's). I checked and the guage read a little low but everything else was running. Bought a can of r134a and according to the instructions on the can I shook well and kept it upright. Seemed it wasn't emptying and the vent temp was still in the 60's. Checked some videos on utube and some of them showed refilling with the can upended. I tried that the next day and it worked! Just took a little liquid. Vent temp back in the 40's.