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I've never been overly impressed with the air conditioning performance in my 08. I've tried playing with the charge level as well, to no real avail.
I don't like that the same size cab, which was originally (pre-08) cooled with almost 3 pounds of R134a is now only cooled with not even 1-3/4 pounds of refrigerant.
I don't even find the air sufficient in a single cab truck, 08-10.
I have often thought about putting a ball valve in the heater hose line to interrupt flow through the heater core. Most every big truck (transport, dumptruck, etc.) has a shut-off valve for the heater core for summer months.
The problem with the vacuum actuated one is, as you've stated above - the controls are all electronic now, there isn't any vacuum to the head unit in the dash anymore, and some trucks don't even have a vacuum pump!
It's getting to the point now weather wise, if you put a shut off in the heater hose you'd probably be ok without heat for a while. And worse came to worse, jump out, pop the hood and spin the valve open if you needed to.
I'm going to take some before/after measurements when I do this, but before that I also need to replace the blend door motor for the temp door.
Ford Senior Diesel Technician
2008 F-350 4x4 Off Road 6.4 Powerstroke Diesel
There are strange things done 'neath the midnight sun by the men who moil for gold.
The arctic trails have their secret tales that would make your blood run cold.