I just bought a 2011 F250 Super and the manual A/C buttons were stuck on
Max A/C and wouldn't change. I fiddled with every switch on the dash thinking
it might be a stuck switch and eventually all the buttons started working. This
truck has SYNC, which works fine, and I can't find anything else wrong with the
truck.

When the buttons are lit, it blows good and cold, in A/C and Max A/C. The problem I'm having now is that they won't light up at all. Visual inspection shows nothing obvious under the hood, and it has a charge of freon.

I drove from El Paso, TX to Clarksville, TN with it working just fine, but stuck
on the Max setting. I'm thinking electrical gremlins, like stuck switch or a relay,
but would like some other pointers if someone else has had this kind of problems.

Thanks!

 

It was most likely soft drink spilled on the dash. Gonna get a cleaning.