The indy evacuated and weighed my r134 and it was a 1/2 ounce off.My a/c is ice cold at 80mph on low and cool on high.I can tell the temperature change when idling or driving around the city compared to an 60 mile road trip.I have tinted my windows and replaced the monovalve last weekend.When I was doing the monovalve I dropped one screw and ended up taking out the windshield reservoir,battery and battery tray to find the screw and I am glad I did.I got the shop vac out and vacumnned out years of leaves. I guess it is what it is.I live in a hot and humid climate.I do want to make sure the flap closes to make sure no fresh air comes in when I hit recirculate.