Hello Jdemaris, The sysytem charged with the proper amount of refrigerant should have put you in the ball park. It seems that its about 1/6 off at the compressor return temp. 12ounces of EXTRA, refreigerant made a difference. The blending system may be at fault, heat to air ratio is about 3 to 1,btu's there is, that is why adding heat to the air will modulate the output temp. If the heat is overwelming the A/C, and the a/c is working fine, you should see a lot more of condensate coming out of the drain then normal. 12 ounces extra is way too much. What happens with the exta amount of refrigerant is that is gives you a bit more cooling power, but it also adds pressure to the system. When the low side pressure rises so does the high side. The output temp also goes up. I would try this. Take the heater hose/s going in to the air box and close them shut. I use 2 big flat washers and a vise grip. This will tell you if the heat is on full blast. Remember with a 3 to 1 ratio, heat will win the battle. Hope this helps. P.S. F350 full of fuel 7440 Lb. Good Luck................... Guido.
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