Wanted to share an experience with air conditoning on my SD 07 5.4l 4X4 FX4 Extended Cab. It has 17,000 miles and warranty up in December.
I had been having issues since I bought the truck at 13,000 miles with the air cooling adequately. I had taken it to 3 different dealerships and they all came back with the excuse that it is cooling 20 degrees or so below outside air temp and that is normal. Well it has been 104-106 degrees everyday this week and when you came to a stoplight or just slowed down, my digital thermometer, that I carry, would go to 90 degrees plus on max air and that was the air coming out of the vents. Vacuum leak? Not enough freon? Well I was feed up on sweating so I took it to a small dealership in Mcgregor Texas. Its one of those good ole "country bumkin" dealerships which is my kind of place. They took it in, and within 30 minutes let me know that it was "overfull" on freon. They recovered the freon and it had 3.50 lbs of freon. According to the tech, it was close to what an Excursion should have been charged. It was indicated that the factory could have overfilled the AC. The dealership charged it properly, did their multi point inspection, never charged me a dime.
Now it cools like a meat locker, even at an idle. The temp out of the vents run at 49 degrees going down the hiway and 55 degrees at a stop on Max air, 62 degrees at a stop on normal air.
I knew you could overfill but I had never experienced it to this capacity.
Frustrating but fixed. CoOl Air!!!!

 

Interesting. Never knew too much refrigerant could have that much effect on cooling performance.

 

Yep, if you have too much coolant it's the same effect as not enough.

 

Interesting.
My 2009 cools OKAY, but it isn't anything to write home about. Not as bad as you describe yet annoying that I have to keep it on Mac A/C all the time for adequate cooling. I'm keeping an eye on this thread.

 

The first fefw dealers apparently never put a set of gages on it. They must have just felt the air and said "looks good to me". It sure looks like an easy find from the chart...

 

I was the same, annoying to have Max air on all the time. Its 105 here today and the only way to stay cool is Max Air!

 

Why do you find that annoying? At 105 ambient, you NEED max a/c capacity! It has to work that much harder to cool outside air from 105 down to a reasonable temp.

 

I use nothing but the new R134a+ it has better cooling characteristics. I get 40* from the vents when its upper 90s here in Ga.

 

my 08 F350 crew cab V10 it was 103 in tulsa I set in 62 degree comfort,so when they work they work well,did have to put it on max air.

 

The extra noise annoys me. But now, I can switch over from Max air after it cools the interior. I agree, it does have a harder time cooling the outside air rather than the recirced air.

 

Not so much a reply but a question.

I have a 99 f-550 that the pump will not kick on. It was working fine even had the shims worked on so the clutch would stay ingaged as its supposed to. Now, after working for a few months it just quit today.

I fooling with it and unplugged the pressure switch (I think that what it is) I stuck a little wire in the plug to jump the connections and the clutch turned on and started working. But.....theres always a but....it started to spit freon out the back of the pump. I'm assuming theres an overflow spicket back there just for that reason but cant figure out why it stopped working to begin with.