I've had this problem going on for a couple of years or so now, and finally ready to do something about it. A/C will run cold for anywhere from a few minutes up to an hour or so, then the compressor will "slip out of gear" and the fan will just blow ambient-temp air. I can eventually get the compressor to turn back on by toggling the A/C button off and on multiple times, but it takes anywhere from a dozen to 40-50 toggle tries to get it. This happens regardless if I'm starting with a cold start, have been running errands around town (multiple stops), or extended highway driving. Any ideas, before I head to a dealer?