Air Conditioner Puzzler... Any Ideas?

[Rodger Wilco]

Here's a real head scratcher:

Having problems with my air conditioner working intermittently. It will turn on and work great for a while and then at random start blowing dry unconditioned air.

Also sometimes I cannot get the AC to engage no matter what the switch position. I will try for a couple minutes with no luck and try again ten minutes later and it turns on just like normal.

I am thinking that this must be a computer issue? Some sort of programing or sensor? Maybe a switch issue... not sure the switch will illuminate when depressed and in AC mode just like normal.

When it works it works great so I know that it is not a compressor or freon issue.

2010 Yaris HB only 14,900 miles, great car all around.

I live in Phoenix it was 106 today and not even June yet, any help would be greatly appreciated!