So this is yet another "my a/c isn't blowing cold" post but I have gauges and YES I know I have a leak because I have added 3 12oz cans of R134a to get to this point.
First pic is @ 1800-2000 rpm after adding 3 cans,

Second pic is at idol,

When driving I can get a temp split of 30 degrees, outside air was like 87/88 degrees & very humid and I could get the center vent down to apx 58 degrees,

Sorry for the blurry pic, hard to drive and hold an iphone steady for pics on back country roads.

This all started a few days ago when I got in my truck and the temp was just about 95 outside, I drove all the way home on max ac recirc on high fan speed and had sweat on my brow during my 30 mile commute. My truck has been very dependable since I bought it new, it has never been back to the dealership for ANY repairs since the day I drove out with it. My a/c performance has never really been what I would call stellar but after reading the horror stories here with EATC (which I have) and blend door nonsense I decided to live with what I had. Until now. My next task is finding the dreaded leak, however I noticed on several occasions when I take the black cap off the high pressure side port, I get a wisp of pressure loss which I find odd since the valve is suppose to be closed and I hope my schrader valve IS leaking, if so, that should be an easy fix or maybe it just needs to be tightened? If so, I assume there is a special tool for a/c schrader valves? I don't think my tire one will work, looks too tiny? MY condenser other than normal bugs looks pretty clean and I don't hear any odd noises from my compressor so I kind of assume its an o-ring or some other connection leak, their seems to be no really common leaks with these (2004-2008) trucks that I can find searching the web?

Thanks for any input!

 

I just looked at my 08 with a 5.4 and it holds 2.25 lbs, 36 oz. You put in 36 oz, unless it was empty when you started your overcharged.

 

I think your correct, it was empty...

 

95* day with "average" humidity (at idle) you should have
Low side should be around half the outside temp 95 / 2 = 42
High side should be around double outside temp 200ish give or take
And your air vent temp should be half outside temp or less

Higher humidity means you're cooling and drying the air coming out of the vents. Means you might not get the perfect heat transfer you'd like to see



I've seen highside lines leaking, not necessarily on F150s, but just in general

Things to consider

• Cooling fan / clutch?
• Blend door operation
• Evap drain tubes correctly draining
• AC compressor performance

 

Either you're overcharged or you have a high side problem (restriction, inadequate airflow). Hit the condenser with the spray from a garden hose and see if the high side drops and cooling works better.

FWIW, you're always best to recover, repair, evacuate, then charge exactly by refrigerant weight. Anything else is just guessing.